List Literal

Some lisps use square brackets [] to give a literal notation for lists of evaluated values lists. This syntactic sugar for writing something like list 100 (+ 10 20) 300. Instead it lets you write [100 (+ 10 20) 300]. In some situations this is clearly nicer, but it does use up the [] characters which could possibly be used for more interesting purposes.

This should be a simple addition for people looking to try out adding extra syntax.