This wasn't as simple as changing the persona in the XML,
because the same layout is used for a post whether reblogged or not.
So the persona needs to be changed programmatically for reblogged posts.
For this, the `AuthorView#setPersona()` method has been made public and
was changed to always set all views into the desired state to support
usage in a RecyclerView.

* TextInputView can resize up to 3 lines again

Signed-off-by: goapunk <noobie@goapunks.net>

* remove the forced hiding in ThreadListActivity as it should no longer be required

Signed-off-by: goapunk <noobie@goapunks.net>

This changes the visibility of some methods, removes unnecessary
abstractions and fixes static import of GroupId constant.

Also add NotNull annotation to classes that were touched

This also adds two integration tests and improves some small details

Also react to incoming group invitations

Also close keyboard when returning from message fragment