ComposeWindow: Move media_image into the ui file
Merge branch 'master' into compose-completion
ComposeWindow: Add rudimentary nick completion

still slightly buggy.
Merge branch 'master' into compose-completion
ProfilePage: more g_message -> g_debug transitions
ComposeTweetWindow: Update completion on cursor change
ComposeTweetWindow: Hide the completion window on focus loss
ComposeTweetWindow: Fix completion with empty word
Completion: Correctly hide window on space
ComposeTweetWindow: Move word detection into its own function

We will also need it in another place
ComposeTweetWindow: Fix completion in newline

This previously did not work because the way we detected the 'current
word'(i.e. the word the cursor is in) did not take newline texts into
consideration
ComposeTweetWindow: attach compose window to text view
Merge branch 'compose-completion'