Redefine IS_LAYER_ON/OFF() as aliases for existing layer functions (q…

…mk#6352)

* Add IS_LAYER_ON_STATE()/IS_LAYER_OFF_STATE() macros

* Add docs for IS_LAYER_ON/OFF(_STATE) macros

* Remove IS_LAYER_ON/OFF_STATE redefinition in userspace

* Run clang-format on quantum/quantum.h

* Redefine IS_LAYER_ON/OFF(_STATE) as aliases of existing layer functions

Also update relevant doc entries.

Needs testing to check if this breaks existing IS_LAYER_ON/OFF usage in certain
edge cases (namely calling the macros with 0).

* Reformat layer check function docs

quantum/quantum.h

@@ -258,8 +258,11 @@ void set_single_persistent_default_layer(uint8_t default_layer);
 
 void tap_random_base64(void);
 
-#define IS_LAYER_ON(layer) (layer_state & (1UL << (layer)))
-#define IS_LAYER_OFF(layer) (~layer_state & (1UL << (layer)))
+#define IS_LAYER_ON(layer) layer_state_is(layer)
+#define IS_LAYER_OFF(layer) !layer_state_is(layer)
+
+#define IS_LAYER_ON_STATE(state, layer) layer_state_cmp(state, layer)
+#define IS_LAYER_OFF_STATE(state, layer) !layer_state_cmp(state, layer)
 
 void     matrix_init_kb(void);
 void     matrix_scan_kb(void);