* clean up keyboard header files
* use #pragma once include guard
* convert tabs to spaces
* remove redundant #include statements
* update revision references to main header (`../meira.h` -> `meira.h`)
* refactor default keymap
* use LAYOUT as layout macro reference
* use enum statement for layer indexes; make layers contiguous
* use four-space indent
* update keycode grid alignment
* update layout macro aliases
* move layout macro aliases to info.json
* alias KEYMAP to LAYOUT_ortho_4x12 so the user keymaps don't have to be edited
* touch up meira.h
There's no Planck MIT layout reference here.
* add copyright headers
* workaround patch for grahampheath keymap
The `matrix_init_kb()` function in `meira.c` calls `backlight_set()`, but the grahampheath keymap disables Backlight to make space for Audio, causing the firmware to fail to compile.
This commit wraps the `backlight_set()` call in an ifdef statement, so the call is excluded if Backlight is disabled.
* clean up rules.mk inline comments
* re-order rules.mk settings
* clean up readme.md
* correct link to keyboard image
* change metadata section to unordered list
* spelling corrections
* update make instructions and Docs links
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