Fixes for cmake 2.8.12

For some unknown reason, cmake doesn't pass macro definitions from
add_definitions() to moc anymore.
Added ItemSync plugin for synchronization with files
ItemSync: Display icon and base name
ItemSync: Fix file order and remove old files
Remove static object initialization
ItemSync: Don't rename copyq_* files

Files created in the application (i.e. copyq_0002* etc.) can have
different order in other tabs/sessions. So they shouldn't be renamed
once created.
Keep internal data after item is edited or transformed
ItemSync: Button to open file dialog to get sync directory
Resize plugin settings widgets vertically