Fix two Blog NPEs

Closes #571

See merge request !264

Closes #571

Simple UI for Managing and Importing RSS Feeds

Please note that this does not yet include the reblogging style for displaying imported RSS entries.

![device-2016-07-26-170732](/uploads/e7f53f72e955d0c37518e0d552121105/device-2016-07-26-170732.png)
![device-2016-07-26-170755](/uploads/b8e0c91ed496b618d330364e840458dc/device-2016-07-26-170755.png)
![device-2016-07-26-171519](/uploads/fae5c16255d5a67673a4bd9be73c165f/device-2016-07-26-171519.png)

Closes #517

See merge request !251

Post new RSS entries into the user's personal blog

Closes #486

See merge request !250

Keep track of which RSS entries have been seen

This is done by remembering the time of the latest entry.
All entries newer than that are considered new and will be posted.

Closes #485

See merge request !249

Implement background task for fetching RSS feeds

* Implemented in briar-core as a `ScheduledExecutorService`
  that gets started when the app starts
* The briar-api has a `FeedManager` interface
  that the UI can use to register and unregister feeds
* In this first iteration, feeds are fetched via HTTP(S), not Tor

Closes #484

See merge request !247

Closes #517

Closes #486

This is done by remembering the time of the latest entry.
All entries newer than that are considered new and will be posted.

Closes #485

* Implemented in briar-core as a `ScheduledExecutorService`
  that gets started when the app starts
* The briar-api has a `FeedManager` interface
  that the UI can use to register and unregister feeds
* In this first iteration, feeds are fetched via HTTP(S), not Tor

Closes #484

Fix NPE in ContactListFragment

Closes #562

See merge request !261

UX improvements for crash reports and feedback

(The background color of the first screenshot is white, but I now changed it to use the same background color like everywhere)
![device-2016-08-01-174433](/uploads/a457489f61a7f0af48d4ebf8e3a10bf0/device-2016-08-01-174433.png)![device-2016-08-01-174500](/uploads/5275bff37db5a35e9ac9ad5038c06142/device-2016-08-01-174500.png)![device-2016-08-01-174532](/uploads/d0281156feff94262789102bd420ffeb/device-2016-08-01-174532.png)![device-2016-08-01-180330](/uploads/ed2d2d35b465df22b717cb84567a555f/device-2016-08-01-180330.png)

Closes #335

See merge request !246

str4d authored 8 years ago and Torsten Grote committed 8 years ago

This enables the toolbar to be used as an action bar, and tinting of UI elements
like checkboxes.

Closes #562

The old behaviour was a leftover from the days of limited retention periods. The new behaviour will interact better with dependencies and message queues.

Remove forum invitations from list instead of reloading

Closes #543

See merge request !255

Show Blog Post times with new timestamp and update it periodically

Closes #559

See merge request !260

Closes #559

Show Responses to Forum Invitations in Private Conversation

Closes #472

See merge request !257

Pause Periodic List Refresh when View is not Visible

This MR also sneaks in a second commit which stops the cevron in the forum list to sometimes lose its blue color. I noticed this when testing this MR with short refresh intervals. This is not as nice of specifying the color as a tint, but unfortunately tints are not yet ready for primetime on Android.

Closes #553

See merge request !259

Closes #553

Show notifications for new blog posts

This also adds a setting allowing people to turn blog post notifications off.

As instructed, this does not yet improve upon the current notification mechanism, but rather follows it, leaving the improvements for  #289.

Closes #488

See merge request !258

This also adds a setting allowing people to turn blog post notifications off.

Closes #488

Closes #472

Show Personal Blog When Clicking On Post in Combined Blog Feed

This is your own personal blog when clicking on your own posts. Note how you can also write posts from that screen and no trust indicator is shown for the posts:
![device-2016-07-28-164921](/uploads/92993d579e26307ee0c6172cfd67bcd8/device-2016-07-28-164921.png)

This is somebody else's blog on a dedicated screen after clicking on a blog post:
![device-2016-07-28-164949](/uploads/d6c18d5b2ea81fd16b0300ae7b76aac5/device-2016-07-28-164949.png)

Closes #415

See merge request !256

Closes #415

Merge branch '535-formatexception-when-loading-contact-list-after-receiving-invitation' into 'master'

Use Client Layer Events in ContactListFragment

This prevents trying to access the same group metadata in different groups.
Also, the conversation does not need to be reloaded once introduction messages arrive.

Closes #535

See merge request !254