Migrate crash reports to ACRA

Closes #123.

See merge request !140

Converts the splash screen to XML format

Removes all programatic calls that modify the layout and uses the XML
resource instead.

See merge request !123

Refactor `ContactListAdapter` to be used for Introductions and Forum Sharing

This MR introduces an abstract `BaseContactListAdapter` which provides
most of the adapter logic. The original `ContactListAdapter` extends it to
show date and online status of the contacts.

The new `ContactChooserAdapter` which is used for introductions extends
the `ContactListAdapter` and adds logic for graying out contacts from
different identities than the currently used one.

A new `ContactSelectorAdapter` extends the `BaseContactListAdapter` and
allows to select multiple contacts. It offers a method to return a
collection of all selected `ContactId`s.

Closes #292

See merge request !151

This commit introduces an abstract `BaseContactListAdapter` which provides
most of the adapter logic. The original `ContactListAdapter` extends it to
show date and online status of the contacts.

The new `ContactChooserAdapter` which is used for introductions extends
the `ContactListAdapter` and adds logic for graying out contacts from
different identities than the currently used one.

A new `ContactSelectorAdapter` extends the `BaseContactListAdapter` and
allows to select multiple contacts. It offers a method to return a
collection of all selected `ContactId`s.

This commit also sneaks in an animation when the 'Share Forum' button
is clicked.

Closes #292

Removes all programatic calls that modify the layout and uses the XML
resource instead.

Don't connect to inactive contacts

Two changes:

1. Don't use remote transport properties for contacts that are in the process of being introduced - this avoids wasted connection attempts, as we can't create stream contexts for such contacts.

2. Don't activate contacts when receiving incoming streams - doing so was meant as a workaround for newly introduced contacts having inconsistent views of their introduction status if the introducer was offline. But it just shifted the inconsistency elsewhee, so this change removes the workaround.


See merge request !153

Use consistent styling for dialogs. #296

Converted all dialogs to use the support library and the Briar theme, so they have a consistent Material Design appearance across all Android versions.

See merge request !152

This avoids wasted connection attempts to contacts that are in the process of being introduced.

This leaves the contact and the introduction session in inconsistent states.

Move create forum post and share forum buttons in action bar

According to the designs in #305, the 'create forum post' and 'share forum' buttons will go into the in action bar.

In the spirit of keeping MRs small and to avoid conflicts with #306, I did this first and independently of future work.

This also introduces constants for the `GROUP_ID`, `FORUM_NAME` and `MIN_TIMESTAMP` as they were used for the two buttons.

Closes #313

See merge request !150

Remove avatar code and layout from ConversationActivity and ConversationAdapter

Please note that I have not been able to test this MR on an actual device as I have none at the moment :(

Closes #293

See merge request !148

Show relevant introduction decline responses in the conversation

* If the user has already declined, we don't show that the other
  introducee has declined as well. The backend doesn't have that information, so
  this is compatible with the principle of showing what we know.
* If the user has already accepted or hasn't yet responded, we now show the
  decline response in the private conversation with the introducer. If
  the user hasn't yet responded, we hide the accept/decline buttons
  in the introduction request message.

Please note that I do not have three devices at the moment to test this MR in its entirety in practice. I created another test which is hopefully sufficient to ensure that the modifications are correct.

Closes #295 

See merge request !149

Encrypted crash reports

Part of #123.

See merge request !128

This also introduces constants for the GROUP_ID, FORUM_NAME and
MIN_TIMESTAMP as they were used for the two buttons.

Closes #313

* If the user has already declined, we don't show that the other
  introducee has declined as well. The backend doesn't have that information, so
  this is compatible with the principle of showing what we know.
* If the user has already accepted or hasn't yet responded, we show the
  decline response in the private conversation with the introducer. If
  the user hasn't yet responded, we hide the accept/decline buttons
  in the introduction request message.

Messages an introducee receives in a `FINISHED` state are now being
ignored and deleted.

Closes #295

Remove Tor binaries from repo. #203

This patch removes the Tor binaries from the repo - the binaries will be downloaded at build time and verified using SHA-256 hashes included in the repo.

After this branch has been merged I plan to reduce the size of the repo by rewriting the commit history to delete the Tor binaries (and various other cruft that used to live in the repo, such as fonts).

After the history has been rewritten, everyone will need to delete their local repo and clone a fresh copy. I'll send out some warnings beforehand.

See merge request !147

Will currently fail at runtime; requires a public key and a server onion.

Introduction Integration Tests

This introduces these integration tests for the introduction client:
* normal session where both introducees accept
* normal session where the first introducee declines
* normal session where the second introducee declines
* one session where a contact is introduced to herself
* one session where two identities of the same contact are introduced to each other

I managed to get rid of the non-determinism missing validator problem by properly injecting the eager singletons.

Attention: This is based on !143 which addresses a corner case that is already tested here.

See merge request !139

Addresses two Introduction Corner Cases

* force decline when two of our own identities are introduced to each
  other
* throw away introduction requests to the same identity
  (impossible to trigger from UI)

Closes #284
Closes #294

See merge request !143

Closes #293

* normal session where both introducees accept
* normal session where the first introducee declines
* normal session where the second introducee declines
* one session where a contact is introduced to herself
* one session where two identities of the same contact
  are introduced to each other

This introduces a new IntroductionAbortedEvent to signal when the
protocol was aborted. It is not yet used in the UI.

It closes #276

* force decline when two of our own identities are introduced to each
  other
* throw away introduction requests to the same identity
  (impossible to trigger from UI)

Closes #284

Don't use inverse style for progress bars. #286

Fixes the appearance of progress bars on Gingerbread, no difference on other platforms. Thanks to @str4d for finding the source of the problem.

See merge request !145

Fix flicker when loading contact list

Fixes #297.

See merge request !144

Catch runtime exceptions from QR code decoder. #298



See merge request !146