Add support for llMessage:withVars:andCode and llProperty:withType for specifying low level code without having to stick C inside the compiler. Redo array built-in type to use this feature.

#{
	foo <- 42
	new <- {
		#{
			bar <- foo
		}
	}

	main <- {
		print: (string: ((new: ) bar)) . "\n"
	}

}