In new grammar:
- Removed support for primitives
	- Instead, primitive usage should look like regular messages
		- E.g. if{condition}, {trueCase} Else {falseCase} is a primitive usage
- Added frame as pseudo variable
- Added support for postfix slotAssignment

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