Keyboard: dactyl manuform 6x6 added (#3662)
* mouse layer keys shifted
* mouse layer keys shifted
* manuform 5x6 added
* mouse layer keys shifted
* manuform 5x6 added
* dactyl_manuform 5x6 keymap added
* reorg. dactyl manuform folder
* removed LAYOUTS = ortho_4x12 for 4x5
* Rows and Cols in config.h fixed
* MASTER_LEFT
* 5x6 matrix fixed
* keymap updated
* removed the i2c, serial, split_util and matrix files and inserted SPLIT_KEYBOARD
* default keymap for dactyl_manuform 5x6
* Fixes for Dactyl Manuform
* Add/update default keymap
* readme dactyl_manuform updated
* links to keymaps added
* dactyl_manuform 6x6 added. README updated
* dactyl_manuform README updated
* cleanup
* more cleanup
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