[Keyboard] Add Wraith keyboard (#6810)
* start wraith firmware
* completed initial setup
* added amber keymap to wraith
* fixed LEDs, wrote readme files
* reverted bootloader type after troubleshooting
* decapitalised files and directory as per qmk standards
* Update Wraith keyboard folder
- Add timer keymap with documentation
- Remove boilerplate in rules.mk, ready for pull request
- Update info.json with ISO and ANSI layouts, ready for QMK Configurator
* Add Wraith image to readme.md
* Fix Wraith keyboard's QMK Configurator support
- Update info.json
- Add layout macros in wraith.h
- Update keymap.c files to use LAYOUT_all
- Fix readme formatting
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