[Keyboard] Add Owlet60 Keyboard to qmk_firmware/keyboards/handwired (#6803)

[Keyboard] Add Owlet60 Keyboard to qmk_firmware/keyboards/handwired (#6803)

* first commit, skeleton code, not sure if working

* Owlet 60 working firmware, json not sure

* use json from kle to qmk converter

* deleted temporary text from owlet60.h

* owlet60 working oled and led firmware

* moved owlet60 to handwired

* updated readme.md

* Revert "owlet60 working oled and led firmware"

This reverts commit 27f9465aabd62d9ee445b477a02af348160532c1.

* Revert "moved owlet60 to handwired"

This reverts commit 9b8e8344fc303ddc4dcc3b023d4e9d05b89d5800.

* revert changes, moved owlet60 to handwired, updated copyright blurb

* fixed readme.md

* removed duplicate items

* resolve merge artifact

* Update keyboards/handwired/owlet60/readme.md

Co-Authored-By: fauxpark <fauxpark@gmail.com>
* check out merge artifacts with qmk master

* Update keyboards/handwired/owlet60/matrix.c

Co-Authored-By: fauxpark <fauxpark@gmail.com>
* Update keyboards/handwired/owlet60/matrix.c

Co-Authored-By: fauxpark <fauxpark@gmail.com>
* Update keyboards/handwired/owlet60/matrix.c

Co-Authored-By: fauxpark <fauxpark@gmail.com>
* Update keyboards/handwired/owlet60/matrix.c

Co-Authored-By: fauxpark <fauxpark@gmail.com>
* removed redundant rule on oled_testing/rules.mk, refactored mux switching code on matrix.c