Add satan keymap: HHKB-alike based on dbroqua's, with mouse functionality (#1948)

Add satan keymap: HHKB-alike based on dbroqua's, with mouse functionality (#1948)

* Add satan keymap: HHKB-alike based on dbroqua's, with mouse functionality and without LED functionality

* move mouse layer to DOUBLE_HOLD, add UTIL layer for TRIPLE_HOLD

- UTIL layer
    - currently has "RESET" key and nothing else.
    - functionality otherwise covered by bootmagic should go here

- small bugfix: dispatch of [QTY]_HOLD should be based on range tap count
  falls in, not exact count.