Octagon V1 Support (Port) (#2184)

Octagon V1 Support (Port) (#2184)

* Preliminary commit for Octagon V1 support

This is essentially a cp -R v2 v1 with a few things changed to
get it to compile and build.

* The Octagon V1 supports up to 84 keys as opposed to the V2 which
supports up to 86. This commit changes the keymap to match it.

* Temporary default keymap just to get things to compile

* Update readme file

* Fix switch matrix

* Fix underglow lighting option

* Fix keymap to take care of shifted columns

* Fix keymap formatting

* Remove un-needed files left over from rasmusx

* Make Octagon V1 have its own keymap directory with default keymap

* Make Octagon V2 have its own keymap directory with default keymap

* Cleanups and readme edits