Version 0.5: firmware space optimization, we save as much as 1K of firmware now.

By using only integer math we saved a little more than 1k of your precious firmware space now, plus other minor bugs and some validations.

Thanks to CO7RR Josue to take the time with me to understand the math behind it.

Implemented a boolean array to check the status of the clocks si.clkOn[clk] if true then that clk is active.

As usual docs are update to reflect changes and correct typos.