Previously KEYMAP referred to the KEYMAP_ARROW layout and had 45 keys. It makes
more sense for the default keymap to be the 44 key layout, as is implied by the
name.
Additionally keymaps for all other known layouts have been added:
KEYMAP - base layout
KEYMAP_ARROW - additional key in bottom right
KEYMAP_COMMAND - additional key in bottom left
KEYMAP_ARROW_COMMAND - combination of KEYMAP_ARROW and KEYMAP_COMMAND
