Add support for the crkbd r2g by mechboards (#15283)

* r2g folder groundwork

* Default mb keymap featuring mb logos

* Migrate Oled to keyboard folder

* Move rules configs to support config better

* update readmes

* Liscnece update

* Update config and fix issues caused by redef errs

* funciton name adjusts, define specific rgb modes

* move default oled font to postconfig

* update oled in line with develop merge

* fix return value

* Add some default rgb matrix defines

* del ugfx

* remove #include <stdio.h>

keyboards/crkbd/post_config.h

@@ -41,3 +41,9 @@
 #        define RGB_MATRIX_MAXIMUM_BRIGHTNESS 120
 #    endif
 #endif
+
+#ifdef OLED_ENABLE
+    #ifndef OLED_FONT_H
+        #define OLED_FONT_H "keyboards/crkbd/lib/glcdfont.c"
+    #endif
+#endif