Mantis #4274
Basic cleanup of GUIMultiImage.cs
New image in GUIMultiImage is loaded in a worker thread
Additional code cleanup of GUIMultiImage.cs
Fixed typo in log message
Compensated for a bug in the font engine in regards to long right aligned fade-labels
Merge branch 'refs/heads/BUG-4204-render_loop_blocked_by_MultiImage_control'
Merge branch 'refs/heads/BUG-4274-right_aligned_fadelabel_is_empty'
Merge remote-tracking branch 'remotes/upstream/master' into 1.3Final_ADDON3_TV_Music