a11y: Define the relations between labels and interactive controls these
are labeling in the settings window.
a11y: Remove "RT by foo" default label from the retweet row of the main
tweet listing. Fixes unintentional reporting while browsing the list
with orca screen reader.
a11y: One more occurence of label and its interactive control in the
create account widget this time.
a11y: Label unlabeled image buttons inside the compose window and in the
main window tweet list. Also make the length indicator inside the
compose window into a label for tweet entry so screen reader users will
get remaing count reported during typing.
a11y: provide accessibility label for the menu button inside the tweet
info widget.
a11y: get rid of the (x unread) text in the list of DM threads and also
provide accessible label for the delete image button.
Merge branch 'master' of https://github.com/baedert/corebird
Merge branch 'master' of https://github.com/baedert/corebird

Conflicts:
	ui/dm-thread-entry.ui
	ui/tweet-list-entry.ui
Merge branch 'master' of https://github.com/baedert/corebird

Conflicts:
	ui/tweet-info-page.ui
Merge branch 'master' of https://github.com/baedert/corebird
Merge branch 'master' of https://github.com/baedert/corebird
tweet-list-entry: some buttons can't have an accessible child objects
otherwise the app will crash with a segmentation faoult. This needs to
be researched.
Merge branch 'master' of https://github.com/baedert/corebird
Main-window: new tweet button has turned into an image button so provide
an accessible child object setting up accessible label.
Merge branch 'master' of https://github.com/baedert/corebird

Conflicts:
	ui/tweet-list-entry.ui
Merge branch 'master' of https://github.com/baedert/corebird
Merge branch 'master' of https://github.com/baedert/corebird
Merge branch 'master' of https://github.com/baedert/corebird
Merge branch 'master' of https://github.com/baedert/corebird
Merge branch 'master' of https://github.com/baedert/corebird