Optimize binary expressions

[Nickforall]

So, we have this AST, representing 100 + 200 + 300.

{
	"type": "binary",
	"operator": "+",
	"left": {
		"type": "binary",
		"operator": "+",
		"left": {
			"type": "numberLiteral",
			"value": 100
		},
		"right": {
			"type": "numberLiteral",
			"value": 200
		}
	},
	"right": {
		"type": "numberLiteral",
		"value": 300
	}
}

In the end they are all number literals, so we can just optimize this to the expression below, because at compiletime we know these numbers will never change, they are constant.

{
	"type": "numberLiteral",
	"value": 600
}

[Nickforall]

oh, we could also optimize this, but that looks really hard

fn some_function {
	test = 40
	yo = 1000
	hello = 10

	print yo * test + hello
}

I'll probably make a different issue sometime