Should we drop special treatment for Vector and Matrix?

[varunagrawal]

Currently the interface parser has a lot of special conditions for Vector and Matrix types.
For example, in type.py, we check if the type is a Matrix or Vector type and always add a const qualifier as well as a & type.

One case where this is problematic is if we have an argument std::vector<Matrix>& which the parser converts to std::vector<const Matrix&>& which then fails compilation.

Should we drop this special behavior in favor of providing that control to the writer of the .i file? It is a bit more work for the end-user but gives them a lot more flexibility while being more transparent in case of failure.

The good news is that this change would NOT be API breaking since the change is opaque to downstream code.