Force valid indentifier for anything that called format_to_valid_identifier

[nicopop]

Since I have seen some people that still get identifier errors while using options, im making this PR to force the options names to be valid as python detects it

reminder that option display_name stays to whatever invalid name they defined in options.json/category.json this function just make sure its valid as a key

[nicopop]

Ill probably need to add support for accented characters since those appear to be valid for identifiers.
A slightly disgusting fix could be to check each non numeric char in the string through str.isidentifier()

[nicopop]

I tested and using str.isidentifier() against every character is actually pretty free (on the ms taken side)
it might start to influence timing if devs try to use really long options names but if they make sure its already valid then the first check skip all the rest of the code