remove spaces from user's options names to avoid crashes

[nicopop]

Small change that make sure options added by users are compatible with python
by removing spaces in option names
Without this, spaces create some hard to understand, for non-python users, error
like this one bennydreamly got today on discord here

[nicopop]

I got additionnal changes to make it so the option display name keep the unformated option name (if its not already set by user) but I think ill keep it for a separate PR (so don't delete this branch on merge)
edit dec 13: actually idk, I simplified the additionnal code quite a bit, its basically: add a option_display_name = option_name just before both core's and user's format_to_valid_identifier override and replace option_name whenever its not used as an identifier
Edit dec 14: I'll include the changes later today Added in 0341863