qt4ui: fix getting when a conversation has focus
qt4ui: make contactlist render status and block same as gtkui
qt4ui: make contactlist react to avatar_size changes
qt4ui: scale block overlay to match avatar size in contactlist
qt4ui: use better scaling
qt4ui: Implement block, size and stop functionality on avatar widget. Also rename it to match gtk implementation.
qt4ui: ContactInfoRotate implement avatar resize and avatar stop
qt4ui: Try harder to use same string as gtkui. Refs #1503
qt4ui: Add basic spell check functionality
qt4ui: avoid avatar shink in single windows mode
qt4ui: spellcheck respect enable/disable spellcheck preference
qt4ui: spellcheck now honor lang preference
core: Use get_and_instantiate to safely create a Unity launcher entry

Closes #1570