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:

• [x] Examples, basically, in Readme.md

[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

[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.