CI Installer Builds for HoloLens 1 and 2
This merge request adds CI builds that produce installer files for the HoloLens 1 and 2. These jobs are only executed on the master (release version) and develop branch (preview version).
Moreover, it adds an additional job to merge requests which checks whether the project can be built using the Il2CPP and C++ compiler. This will further help to eliminate build errors which only occur in the compiled Unity project and not in the in-editor preview build.
Closes #162 (closed).