Add: Support for parameters in switches

[glx22]

New syntax, compatible with old one:

switch (<feature>, (SELF|PARENT), <ID>(, <param_name>)*, <expression>) {
	(<range>: <return_value>;)*
	<return_value>;
}

[glx22]

It's rebased on top of #156 for easier testing

[andythenorth]

Works for me in Iron Horse.

[FLHerne]

Reviewed code-wise. I haven't yet tried to figure out whether the resulting NFO makes sense.

[FLHerne]

This could be self.var_list += (nmlop.STO_TMP, store_tmp), and similarly below. Current way might be clearer, not sure.

[LordAro]

Code looks good to me