Adding Classes to scarpet.

[Ghoulboy78]

This is a continuation from this discord conversation, and the code I wrote there.

In this PR, I also rename heap.sc to min_heap.sc, and add max_heap.scl as a showcase of what could be done with classes.

NB: This PR should be Squashed and Merged, to avoid adding a bunch of useless commits to the history.

Todo:

• Examples, basically, in Readme.md

[BisUmTo]

I spent 1 hour learning how should max_heap actually work 🤣

The classes.scl is really great, I'll surely use it for my projects

[BisUmTo]

Why do you need to copy the class? 👀

[Ghoulboy78]

Because otherwise you end up just having 1 map and so one object, instead of multiple instances of the same class of object. Taking a copy means that the original is unchanged and the new_object method returns a separate map to the one we input.
I came across this problem when rewriting matrix as a class to make it easier, and then realised that I was having this issue.

[Ghoulboy78]

BTW Im working on inheritance rn. It's not too hard and I've got it mostly working already, just need to figure out whether inheriting a class which already inherits from another class works or not.
Definitely parametric classes won't work (At least I think that's what they're called? I'm talking about things like class MyClass<A> or something like that)

[Ghoulboy78]

Ok so I've finished inheritance. I will be adding extensive documentation to Readme.md cos currently it's got like 1 line tbh.

[Ghoulboy78]

I'm going to make all classes have a couple fundamental methods, which I will put into an 'object' class

Too many changes, I didn't test last release

[opsaaaaa]

Looking at the code. I think this is good for what it is!
It looks thought out. I'm not seeing any obvious better approaches in the few minutes i've thought about it. (native built in scarpet classes might be nice, but also i wouldn't want to write that...)

using call() for everything feels clunky, but thats how you have to do it.

I think large scripts are the once's that would benefit from this.
I remember bemoaning not having classes while writing the spellbook script.
Ill try this out more thoroughly if/when I rewrite it. (or any other larger scripts)

[Ghoulboy78]

Still gotta figure out /script download stuff

[Ghoulboy78]

Yeah, I don't think the /script download stuff is so important, I'm just gonna put this up for review as it is, cos other stuff depends on it.