Added support for parameter declaration for quoted arguments.

E.g.

coll.each' |x| writeln: x
=>
coll.each' writeln: \x
=>
coll.each: {|x| writeln: x}
=>
coll.each: {writeln: \x}

Signed-off-by: Jakob Brandsborg Ehmsen <jakobehmsen.github@gmail.com>