Move GMMK Pro to allow for multiple revisions (#16423)

* Added GMMK PRO Rev2 WBG7 MCU compatibility. Added GMMK 2 WBG7 MCU compatibility.

* GMMK PRO MCU Updates only (removed other kbs)

* fix problems

* Optimize the code.

* Update form develop branch

* Update

* Updater from qmk/develop

* Update

* Update config.h

* Update config.h

* Remove gmmk pro rev2

* move moults31/keymap.c

* Update

* tidy up

Co-authored-by: Joy <chang.li@westberrytech.com>
Co-authored-by: zvecr <git@zvecr.com>

keyboards/gmmk/pro/rev1/ansi/keymaps/willwm/readme.md

@@ -0,0 +1,22 @@
+<img width="567" alt="layer0" src="https://user-images.githubusercontent.com/303042/118893170-da3e3280-b8b6-11eb-9459-f6c339c59bde.png">
+<img width="566" alt="layer1" src="https://user-images.githubusercontent.com/303042/118893191-e0341380-b8b6-11eb-8641-a4fdeeb7cbb2.png">
+
+# willwm GMMK Pro Layout 
+
+Based on [gmmk/pro/keymaps/default](../default/keymap.c), with [VIA support](./rules.mk)
+
+Layer 0
+
+* Delete between F12 and rotary encoder (replaces PrtSc)
+* Home below rotary encoder (replaces Del)
+* MO(1) in default location and Caps Lock location
+
+Layer 1
+
+* Tab -> Caps Lock
+* Del -> Insert
+* Home -> PrtSc
+* Left Arrow -> Home
+* Right Arrow -> End
+* Up Arrow -> PgUp
+* Down Arrow -> PgDn