remove unused usings
tests with gtk. loading a dialog works
open a new window with Enter works
small invoke test
easy calling of methods in the gtk thread
code cleanup
code cleanup
add GtkThread to DataAccess
isBlockedByDialog
there is a useable ColorDialog now
cleanup
delete GtkWindow.cs (was only used for testing)
Merge remote-tracking branch 'origin/gtk-integration' into gtk-integration