Loosen install-time version restrictions

[ZedThree]

The current reliance on finding the MATLAB version at installation time makes it impossible to specify matlabengine as a dependency in pyproject.toml -- as a developer, I have no idea what version of MATLAB the user will be using.

I understand that a particular MATLAB version may require specific Python versions, but from looking at the updates to this repo on new MATLAB releases, there doesn't appear to be any significant change to matlabengine. Is there a technical reason why matlabengine isn't actually backwards compatible with older versions of MATLAB?