[Keyboard] Add support for Model M USB C Controller (#7393)
* added usb c model m
* added readme
* Update keyboards/ashpil/modelm_usbc/rules.mk
* Update keyboards/ashpil/modelm_usbc/rules.mk
* Update keyboards/ashpil/modelm_usbc/rules.mk
* Update keyboards/ashpil/modelm_usbc/rules.mk
* Update keyboards/ashpil/modelm_usbc/rules.mk
* Update keyboards/ashpil/modelm_usbc/rules.mk
* cleaned up code
* removed combo from keymap
* added reset to default
* Update keyboards/ashpil/modelm_usbc/rules.mk
* bootmagic and simplifying default
* Update rules.mk
* removed duplicates
* updated readme
* Update keyboards/ashpil/modelm_usbc/README.md
* Update modelm_usbc.h
* Update keyboards/ashpil/modelm_usbc/keymaps/default/keymap.c
* Update keyboards/ashpil/modelm_usbc/keymaps/default/keymap.c
* Update keyboards/ashpil/modelm_usbc/keymaps/default/keymap.c
* full support for either ANSI or ISO
* Update keyboards/ashpil/modelm_usbc/info.json
* Update keyboards/ashpil/modelm_usbc/info.json
* Update keyboards/ashpil/modelm_usbc/info.json
* Resize the ISO Enter key
* ANSI Enter and Left Shift keys resize
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