Typedef'ed layer_state_t to uint32_t (#3637)

* Typedef'ed layer_state_t to uint32_t.

This enables future work with layer_state_t to uint8_t for optimization purposes.

* Removed accidental xeal60 commit

* Revert to egyptian brackets, added sizeof(layer_state_t) so when layer_state_t is redefined it will automagically work.

* Add additional typedefs

* Add checks for setting layer state

* Update tmk_core/common/action_layer.h

Co-Authored-By: alex-ong <[email protected]>

* Revert commit.

quantum/quantum.h

@@ -61,10 +61,10 @@
 #include "send_string_keycodes.h"
 #include "suspend.h"
 
-extern uint32_t default_layer_state;
+extern layer_state_t default_layer_state;
 
 #ifndef NO_ACTION_LAYER
-    extern uint32_t layer_state;
+    extern layer_state_t layer_state;
 #endif
 
 #ifdef MIDI_ENABLE