Remove ExtensionError from Notification()

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Remove unused code

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Fix uncaught JSErrors

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Fix keybinder not grabbing keys at all

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Port keybinder to the new Gdk VAPI

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>