Dereference pointers when generating getters for pointer variables.
Otherwise, the managed instance would point to the pointer itself
rather than the object at the native instance's address.
- Expression generation for `ConstructorReference` now also recursively
calls `VisitExpression` for the argument if only one argument is
detected. This allows correct overload generation for functions taking
a variable as the default parameter value.
- Default parameters of pointer-to-enumeration types are now correctly
generated similar to primitive types.
Joao Matos
Trung Nguyen