higher level bindings

[pietroppeter]

we could definitely improve bindings with some higher level stuff:

• add templated for setup:, draw: that avoid the need to write the {.exportc.} pragma
• find a way to avoid using PNumber
  • added a converter: converter toFloat(n: int): float = float(n) + exporting lenientops + PNumber = float
• use cstring in all procs (the ones with string are probably broken) but export a string version for all variables that are cstring (such as key, so that we do not need to convert it)
• use enums for all the cstring constants? not sure if it helps that much... when porting it is useful to have the same syntax that you find in p5js.
• ...

[pietroppeter]

or remember there is drawim and work with that! https://github.com/GabrielLasso/drawim