Fleshed out the UI a little. Added a "literal" button that replaces the operator panel with a literal panel. Added the navigation buttons, but they're not functional yet.

#{
	if <- :self trueblock {
		trueblock:
	}
	ifnot <- :self falseblock {
		self
	}
	if:else <- :self trueblock :elseblock {
		trueblock:
	}
	not <- {
		false
	}
}