Add limited, undocumented, Windows and macOS support

[mcafaro]

This change adds limited, undocumented, Windows and macOS support for GitHub-hosted runners. Only the core MATLAB and Simulink products (no toolboxes) will be available for these platforms at this time.

[acampbel]

Looks good. Let's move on this but continue to noodle on the e-matlab dropped file. The implicit-ness of this approach is a little off-putting. Maybe it is better in the end to pass the location into the install script after all, which clients would then need to (get to?) provide for themselves.

[mcafaro]

Looks good. Let's move on this but continue to noodle on the e-matlab dropped file. The implicit-ness of this approach is a little off-putting. Maybe it is better in the end to pass the location into the install script after all, which clients would then need to (get to?) provide for themselves.

An approach to consider in the future is to have a command (or subcommand of install) that resolves "latest" and then explictly pass the resolved release as well as an installation directory (formed from the resolved release name) to the install script. This pushes more logic out of the shared infrastructure but would remove the need for the drop file.