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/default_layout.c

@@ -1,4 +1,4 @@
-#include "keyboard_layout.h"
+#include "action.h"
 
 uhk_key_t CurrentKeymap[LAYER_COUNT][SLOT_COUNT][MAX_KEY_COUNT_PER_MODULE] = {
     // Layer 0