Common: Missing a command for toggling pins

[vkottler]

This may be the single most useful command-line utility we can provide.

Something like pin [<pin_num> | <PORT><PIN>] [on | off] would work best where pin_num is a pin from the female headers and <PORT><PIN> is something like A8 or C5 (may also be routed to one of the female header pins).

Eventually we'll want to support aliases for pins such as braking_solenoid_X so a struct that also implements that capability would be ideal.

[vkottler]

STM32 Nucleo 144 related: I/O schematic, Badgerloop I/O documentation

[vkottler]

It might be better to support read and write, in the future we'll also need an analog read function.

[vkottler]

Want to make sure to check if a pin is already enabled and serving as an alternate function pin

[vkottler]

add info to: pin [<pin_num> | <PORT><PIN>] [on | off | info]

Come up with a way to print info for all pins or all pins from a certain port.

[csgreen3]

Besides alternate functions and analog information this is completed

[vkottler]

Have pin <PORT> [info] display any potential alias of each pin in parentheses at the end

[csgreen3]

[vkottler]

Make the boolean flag mean the alias should not be used to initialize the pin, allow user to have full contorl over aliased pins

[csgreen3]

added initialization