Implement Button from scratch

[ikedam]

Re-implementation of Button from scratch as the current implementation of Button is licensed under CC BY-SA 3.0.
See #21 for more details.

This works as far as I tested on my m5paper.

I referred following documentations to implement this:

• https://docs.m5stack.com/en/api/m5paper/system_api?id=button

Reviewing diffs doesn't make sense at all as I started the development by removing those files

Please review following files:

• https://github.com/ikedam/M5EPD/blob/feature/21_ButtonFromScratch/src/utility/Button.h
• https://github.com/ikedam/M5EPD/blob/feature/21_ButtonFromScratch/src/utility/Button.cpp

[ikedam]

Hmm... as far as I created a simple sketch and compared the behaviors, the original wasReleasefor() looks return non-0 if in RELEASED state and was in PRESSED state for more than ms milliseconds.
It looks strange to me it tests the duration of PRESSED state but its name is wasReleasefor.