- LAYER_MODS() accepts either left or right modifiers
- LAYER_TAP() can use modifier as tap key, related to #422

IS_ANY() is used in usb_usb

GNAP dual controller dual matrix reactive LED

it supports four keyboards and two cascaded hubs

if TAPPING_TOGGLE is 1, then tap a single time should toggle the mods on/off each tap.

Previously this was broken, this fixes it. This allows the same key to either hold (momentary mod) or tap (toggle mod, like capslock).

if TAPPING_TOGGLE is 1, then tap a single time should toggle the mods on/off each tap.

Previously this was broken, this fixes it. This allows the same key to either hold (momentary mod) or tap (toggle mod, like capslock).

Should really not declare variables in .h files - since it's included
in different .c files, a proper linker then complains that the same
variable is declared more than once (once for each .c file that the
offending .h is included in).