feat(xkeyboard): Switch layout group on click

When serveral layout groups are defined for the keyboard
they can be cycled when clicking on the module.

   For example:

   $ setxkbmap -layout us,sv,fr

Ref #84

src/components/controller.cpp

@@ -262,6 +262,8 @@ void controller::wait_for_eventloop() {
 }
 
 bool controller::on(const sig_ev::process_update& evt) {
+  bool force{evt.data()->flag};
+
   if (!m_bar) {
     return false;
   }