Fix two crashes when scanning QR codes
One crash was two due the `Context` being `null` and the other due to the camera being opened within an `AsyncTask`.
Closes#583
See merge request !282
This commit refactors the code for sharing forums,
so it can be used for sharing blogs as well.
It does not yet include code for responding to blog invitations.
Micro Blogs UI
**Attention:** This MR includes several other commits which are supposed to end up in separate MRs. I suggest that you review **per commit**. Once the first two commits have green light, I can split out the other commits into other MRs. This way I don't have to work myself through a long rebase chain every time I make a change to the bottom MR.
This MR is full of commits that introduce features that we will not be using initially. The last commit implements the Micro Blogs UI on top of the framework the first commits establish and hides/disables all future features for now.
I suggest we merge this as is and clean things up later when we have a clearer idea what features we will be doing eventually.





Closes#436
See merge request !214
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
* 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
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.