[ENHANCEMENT] Add scriptInit and listScriptClasses to every script class

[KoloInDaCrib]

Since scripted classes can extend each other now, it is a no-brainer to add functions from normal script class bases into scripted classes.
I initially wanted to add onto the staticFields array when initializing a class, however I couldn't figure out how to convert the functions into hscript.Expr blocks without using a different interpreter for them, as I would need some of Polymod's classes which are normally blacklisted.

[EliteMasterEric]

Oh I see, you're looking to dynamically instantiate scripts from ANOTHER script! I was going to suggest using the constructor but this is a different thing.

As for the actual implementation, this could probably be handled using a single Map<String, Function>, I could see a bug happening where a function gets added in one place and not the other, causing issues.

[AbnormalPoof]

I'm not sure if this is correct, but the code for scriptInit could imply that you can instantiate ANY class instead of only ones that extend said class.

[KoloInDaCrib]

I'm not sure if this is correct, but the code for scriptInit could imply that you can instantiate ANY class instead of only ones that extend said class.

This is true, as the code for this PR was taken directly from how scriptInit is handled by the script class bases. The only difference between the two is that the script class bases force a return type.

[AbnormalPoof]

Works great!