Added macros to Dynamic Keymaps, Zeal60 RGB backlight improvements (#4520)

* Refactored M6-B to use Zeal60 RGB backlight code

* Fixed M6-B LED co-ordinates

* Minor changes to RGB config for Zeal65

* Added dynamic keymaps to WT80-A, WT60-A, WT-80A, U80-A

* Macro implementation

* Implemented macros, API protocol version 8, RGB backlight fixes

* Improved radial effects for M6-B

* Fixed undefined references when building an RGB keyboard after M6-A

keyboards/zeal60/rgb_backlight_api.h

@@ -38,5 +38,6 @@ enum backlight_config_value
 	id_layer_2_indicator_row_col = 0x13,
 	id_layer_3_indicator_color = 0x14,
 	id_layer_3_indicator_row_col = 0x15,
-	id_alphas_mods = 0x16
+	id_alphas_mods = 0x16,
+	id_custom_color = 0x17
 };