Move keyboard event handling into action.c

Since keyboard_layout.[ch] has gained more features, and handles more than just
filling out the keyboard report, move it to action.[ch] instead. I see no sane
way to separate the keyboard and mouse report filling, unless we want to loop
over key states twice, hence them being in the same file.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>

right/src/module.h

@@ -3,7 +3,6 @@
 
 // Includes:
 
-    #include "action.h"
     #include "layer.h"
     #include "slot.h"