Navigation drawer (squashed and rebased).

This is @ernir's work on #30 and #181, rebased onto master with recent changes to ConversationActivity and ForumListActivity ported to the respective fragments.

See merge request !75

Show Bluetooth address from Settings.Secure in TestingActivity

* To help with investigating #225 (and maybe other bugs in future), show the Bluetooth address from Settings.Secure as well as the address from BluetoothAdapter.getAddress()
* Add Settings.Secure.ANDROID_ID to the entropy pool - it may provide up to 64 bits of extra entropy from the perspective of a remote attacker (no extra bits from the perspective of a local attacker in the same user account, who sees the same ANDROID_ID)


See merge request !73

Replaced broken jsocks jar. #228

Fixes #228 and may also fix #217. @str4d and @grote, please test and confirm.

See merge request !72

Update contact list when contacts are deleted. #227

The logic in ConversationActivity for adding or updating items didn't allow for items being removed. We *could* come up with logic for doing that - throw all the items from the adapter into a set, remove any items corresponding to current contacts from the set, then batch update the adapter to remove any items remaining in the set - but I think it would be overly complex. It's simpler to just clear the adapter and add the current contacts.

Also tidied up some adapter code while looking for the bug.


See merge request !70

Don't disable Bluetooth unless we enabled it. #226

Fixes #226

See merge request !71

Metadata for groups. #221



See merge request !69

Also removed unnecessary adapter notifications in various places.

Run hooks when contacts/identities are added/removed. #209

Now that the sync layer is separated from its clients, actions that used to occur within the DatabaseComponent, such as adding or removing private groups when adding or removing a contact, have to be handled by clients.

This patch adds a mechanism for clients to register hooks with the Contact/IdentityManager to be run when contacts/identities are being added/removed. The MessagingManager uses ContactManager hooks for adding and removing private groups, and the ContactManager uses IdentityManager hooks for removing contacts when an identity is removed.

I've also changed the way some components register with the LifecycleManager and EventBus.

This merge request depends on !64 - I'll merge them at the same time. Closes #209.

See merge request !68

Whether or not a class needs to run as a service is an implementation decision.

Separate the sync layer from its clients. #112

This patch contains most of the work for #112. MessagingManager and ForumManager have been converted to BSP clients, and the sync layer's message and group formats no longer contain any client-specific data.

Each client has a MessageValidator that's called by the ValidationManager to validate messages belonging to the client. A new MessageValidatedEvent informs listeners when a message has been validated. This required some changes to the UI, especially the notification manager.

While working on the notification manager I realised it was calling Android API methods from background threads, which may be unsafe, and the notification logic was split across BriarService and AndroidNotificationManagerImpl. So I refactored those classes, along with AndroidExecutorImpl, which was using an unnecessary background thread.

Still to do:
* Synchronise blocks, not messages
* Add message type field to message header as per BSP spec
* Convert TransportPropertyManager into a BSP client
* Convert SubscriptionUpdates/Acks into forum client messages


See merge request !64

ENH: Replaces transport config with namespaced settings

This MR contains the following:

* Adds a new guice module: SettingsManager, that abstracts the settings interface from the underlying database
* Uses SettingsManager to replace the db.getConfig/mergeConfig calls in the Settings activity
* Replaces the getSettings and mergeSettings calls in the database modules to include a namespace parameter. Updates the corresponding queries in the Jdbc module
* Removes the TransportConfig module, as it is not used anymore
* Updates the DuplexPlugin interface, to reflect this change in schemas and calls
* Updates the calls in the corresponding plugins, for both briar-android and briar-desktop
* Updates the hardcoded plugins in the tests to reflect these changes and updates the unit tests.

See merge request !65

Fix adding contacts with Android 6

Adds `ACCESS_COARSE_LOCATION` permission to manifest. Since API 23 this is required for access to the Bluetooth APIs.

See: https://developer.android.com/intl/ko/about/versions/marshmallow/android-6.0-changes.html#behavior-hardware-id

Closes #223

See merge request !67

Since API 23 this is required for access to the Bluetooth APIs
See:
https://developer.android.com/intl/ko/about/versions/marshmallow/android-6.0-changes.html#behavior-hardware-id

Closes #223

Do Bluetooth Adapter enabling/disabling in background thread

Also set the default preferences in a background thread when app starts.

Closes #184

See merge request !66

also run setting the default preferences in a background thread

Closes #184

Offer option to uninstall Briar in a panic event (#211)

Due to the nature of how Android app uninstall works without root access, this requires manual confirmation after a panic event was triggered.

See merge request !63

Due to the nature of how Android app install/uninstall works without
root, this requires manual confirmation after a panic was triggered.

Closes #211

Fix notifications for current conversation

* Remove notification about private messages when viewing the conversation
* Do not show a notification for a conversation the user is viewing

Closes #195 

See merge request !61

Remove upstream jar files from all modules except briar-desktop

This also adds a script for running tests without the Android SDK installed

I've tried to find a better way to do this by conditionally including
the briar-android project in settings.gradle, but failed.
Please note that gradle needs to be installed to run the tests by
executing:
```
./run-tests-without-android.sh
```

See merge request !59

I've tried to find a better way to do this by conditionally including
the briar-android project in settings.gradle, but failed.
Please note that gradle needs to be installed to run the tests by
executing:

    gradle test

Please note that this script uses the 'configuration on demand' feature
which is still incubating,
so not every test run is guaranteed to work correctly.
However, there have not been any problems so far.