overload modifier support

[Gama11]

The overload modifier currently seems to trigger a line break:

class Foo {
	static
	overload extern inline function foo() {}

	overload
	static extern inline function foo(i:Int) {}
}

[AlexHaxe]

yep, that's caused by haxeparser (and by extension tokentree) being mostly unaware of new nightly features

spoiler alert: I'm in the process of updating haxeparser and then tokentree.

I've already patched and PR'd munit. utest thankfully has a patch for spread operator. json2object needs a fix for new isAbstract field in ClassType.