Compile options can be defined in project Makefile such as UDEFS, UADEFS, UINCDIR, ULIBDIR and ULIBS.

SERIAL_SOFT_DEBUG can be defined in the `config.h`

Fixes TMK bug #266.

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).

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.

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).