Show all Forum Invitations, not only the first one to prevent cut-offs and forks
This MR solves the problems outlined in #461 by always showing forum invitations, even if the user already subscribed to the forum.
Available Forums have been renamed to Forum Invitations in the UI:


Closes#461
See merge request !241
Set focus mode properly when scanning QR codes
This simple fix contributed by @m8r-v9bo74 fixed the issue on my Xperia
Pro that could never focus on the QR code before. Focusing and scanning
still works on my other test devices.
Closes#346
See merge request !243
Improve Account Setup Screen
* Explain what "account creation" means on first run (#151)
* Use hints instead of dedicated text views
* Move password strength meter up into the user's view
* Always move user's view to current input field
* Improve "Forgot Password" dialog






Please note that the dialog button colors will be changed in !214 to the official design. Here they have the old colors.
Closes#151, #207
See merge request !229
This simple fix contributed by @m8r-v9bo74 fixed the issue on my Xperia
Pro that could never focus on the QR code before. Focusing and scanning
still works on my other test devices.
Closes#346
* Explain what "account creation" means on first run
* Use hints instead of dedicated text views
* Move password strength meter up into the user's view
* Always move user's view to current input field
* Improve "Forgot Password" dialog
Closes#151
Simple Empty State Messages
This MR implements very basic and simple empty state messages for the
current features.
This is how it looks (note that the contact add FAB will be removed soon):




Closes#327
See merge request !236
Update Timestamps Every Minute
Yes by using `notifyDataSetChanged()` I am invalidating everything, but view binding is very fast and the RecyclerView is smart about it. I could parse the dataset and use `notifyItemChanged()` only on the elements that matter, but this is not generic and a lot more code which is not necessarily faster. I suggest we go with my simple and generic approach for now and optimize when we actually notice a performance problem.
Closes#455
See merge request !238
This commit addes a combined blog feed that shows all posts of all
subscribed blogs in the order the blog posts have been received.
For now, this commit also hides other blog functionality like adding
additional blogs and browsing individual blogs.
Closes#417
This allows for swiping left/right to read other posts by using
a ViewPager.
This hasn't been done as a separate activity, but with
fragments, so both can share the `BlogPersistentData` without
needing to reload it.
Closes#428
This does not yet support multiple identities. It just shows blogs
created by the first identity, but can easily be adapted for
multi-identity support.
Closes#410
Clicking the plus in the toolbar open the `CreateBlogActivity` which
allows the user to create a new blog. Only the first identity is
considered, but support for more identities can be easily added later.
The actual list of blogs in the My Blogs tab will be done in the next
commit.
Font Colors and Separate Themes
Once applied this commit will change the font colors according to the
design and move all themes into a dedicated file.
Closes#333
See merge request !228
Make timestamps prettier and more useful
Here's some example timestamps I have been testing with. That's how it will look like when this MR is merged:

Closes#230
See merge request !235
Deduplicate contact exchange protocol
`ContactExchangeTask` was originally extracted from the Bluetooth invitation task; this completes the refactoring.
Closes#365.
See merge request !199
Make use of Existing Translations
Adds first translations to source code and sets up transifex config
file. Pull more translations later with:
```bash
cd briar-android
tx pull --mode=developer
```
Closes#448

See merge request !226
Adds first translations to source code and sets up transifex config
file. Pull more translations later with:
cd briar-android
tx pull --mode=developer
Closes#448
Separate Date and Author Name in Forum Posts
This also fixes the issue there the trust indicator was shown at the top on some devices.

Closes#442
See merge request !227
Fix IdentityManager hooks
This commit makes sure that there is only one identity manager that is
initialized early enough so hooks can be added properly.
Closes#446
See merge request !225