Debounce_API

[alex-ong]

I don't have any of the listed boards so I was unable to directly test, but did a test on my own board and the debounce-api seemed to work fine.

Basic implementation is adding matrix_debounce() after matrix_scan(). The default implementation is no debouncing. This means all existing code works fine since all existing code does debouncing inside matrix_scan().

After the basic implementation I ported of some of the keyboards.

Converters: Don't have debouncing, so no change required.

alps64: I don't have this keyboard. Compiles.

fc660c: Doesn't seem to debounce? So no change

fc980c: Doesn't seem to debounce? So no change

GH60: I don't have a gh60, but i used my own keyboard with different pin layout and it seemed to work fine. Compiles.

hbkb: I don't have this. Compiles.

hhkb: Debounce algorithm is based on some weird timer so I left it.

infinity: Makefile doesn't work so I didn't attempt anything

infinity_chibios: Makefile doesn't work so I didn't attempt anything

kl27z_kbd: Makefile doesn't work so I didn't attempt anything

kl27z_onekey: Makefile doesn't work so I didn't attempt anything

mbed_onekey: Makefile doesn't work so I didn't attempt anything

onekey: No debouncing. So no change

stm32_f07_onekey: Makefile doesn't work so I didn't attempt anything

stm32_f103_onekey: Makefile doesn't work so I didn't attempt anything

teensy_lc_onekey: Makefile doesn't work so I didn't attempt anything

For all the things where makefile didn't work, I'm running Windows, and get message similar to:

../../tmk_core/tool/chibios/chibios.mk:261: ../../tmk_core/tool/chibios/ChibiOS/os/common/startup/ARMCMx/compilers/GCC/rules.mk: No such file or directory
make: *** No rule to make target '../../tmk_core/tool/chibios/ChibiOS/os/common/startup/ARMCMx/compilers/GCC/rules.mk'.  Stop.