Fix compilation of superclass.
Move constructor mangling to separate file.
Run tests with the new backend.
Fixes for script cleanup

 - Constructor should call super
 - main should return void
Support compiling int literals
Basic super support.
Basic local support
Basic support for integer math.
Implement fields and method calls.
Implement constructors.
Implement more literals.
Basic "if" support.
Implement more nodes

FunctionalCall, ImplicitNil, Cast, FieldAccess, FieldAssign, Return,
EmptyArray
Fix for empy branches in an if statement returning a primitive.
Implement basic comparison operators.
Fix extra dupX1 for FieldAssign nodes.
Fix for compiling vcall
Compile field declarations
Fix for void chaining
Fix for FieldAssign