The CPM command used the wrong branch.
`main` is now the primary branch name.

When an empty struct was received, VAMatlab crashed.
An out of bounds exception was thrown.
This should fix this issue.

On Windows, the IMPORTED_LOCATION should be the dll.

Use a custom command after the VAMatlab build to call Matlab and run
the generator script for the VA wrapper.
The generator script was adapted from the previous VA_build scripts.

- Removed: ITA_VAMATLAB_DEPLOY_MATLAB_EXECUTABLE
- Now always on and not adjustable: ITA_VAMATLAB_SHOW_BANNER
- All others advanced