New features:
 * show mxid in member tooltip
 * Focus on message entry after clicking on a username
 * Basic markdown sending
 * Change Load more GtkButton to GtkSpinner
 * mention: blue highlight for messages with mentions and cleanup css file
 * Redesigned new room creation (fixes #98)

Fixes:
 * Unlock collections and items in secret storage before use.
 * fix: add joining members to the there own room instate to the active room
 * Fix autocomplete crash with unicode usernames
 * Fix url parsing