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).

add ACTION_DEFAULT_LAYER_TOGGLE to toggle a default layer on/off

add KC_MRWD and KC_MFFD to rn42

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).

on OSX KC_MRWD and KC_MFFD are used instead of KC_MPRV and KC_MNXT

Keyboard report should be checked if its transfer finishs successfully.
Otherwise key stroke can be missing when other key event occurs
before the last report transfer is done.

Boot protocol 10ms interval probably causes this problem in case
it receives key events in a row within the period. NKRO protocol
suffers less or nothing due to its interval 1ms.