Add keyboard: 7c8/Framework (#11593)

* Add 7c8/framework keyboard

* Update VIA framework.json definition

* Code cleanup and styling to conform to QMK style guide

* Code cleanup and moving some keymap definitions to a 'steven' keymap in order to create a cleaner default keymap for other users

* Update keyboards/7c8/framework/config.h

Remove #define DESCRIPTION

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Update keyboards/7c8/framework/config.h

remove #define UNUSED_PINS

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Update keyboards/7c8/framework/framework.h

Change layout name to existing layout name.

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Update keyboards/7c8/framework/framework.h

Change layout name to existing layout name.

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Update keyboards/7c8/framework/framework.h

Change layout name to existing layout name.

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Update keyboards/7c8/framework/keymaps/via/keymap.c

change biton32 to get_highest_layer

Co-authored-by: Drashna Jaelre <drashna@live.com>

* change vendor ID from 0x07c8 to 0x77c8, which is unused

* delete VIA .json definition from via keymap folder

* Change framework_grid to LAYOUT_ortho_5x12 in default keymap.c

* remove framework.json from 'steven' keymap folder

* cleanup

* Update keyboards/7c8/framework/config.h

0x77c8 -> 0x77C8

Co-authored-by: Drashna Jaelre <drashna@live.com>

Co-authored-by: Drashna Jaelre <drashna@live.com>

keyboards/7c8/framework/keymaps/steven/readme.md

@@ -0,0 +1,3 @@
+# Steven's Framework layout
+
+This is a VIA compatible layout, exactly like the default VIA keymap, but with some leader key sequences that I find convenient.