Added GPIO_0 module and decimal delay support

[shubhi1407]

Corrected previous errors.

1. Indentation and proper coding style according to repo
2. All directories clean
3. Only 4 files changed.

[shubhi1407]

I have added uS delay support to the exisiting WAIT instruction [ no need for WAITuS :) ]
What has been done :

1. Add regex to tokenize float ie WAIT 26.345 becomes token ['WAIT', 'INT', 'FLOAT']
2. Parse WAIT 26.345 to 64 bit instruction with OPCODE 23. lower two bytes of second word has uS delay data ie 345 uS. ( WAIT 26 would have been parsed to usual 32 bit instruction ie no change would have occured )
3. Modify pru0 firmware to handle uS delays.

In action 👍

[jadonk]

This looks pretty good to me. Can we get a top-level test bench that gives some reasonable code-coverage?

[shubhi1407]

@jadonk Sorry, but what exactly does that mean ?
More examples to test nothing is broken ?