Toggle phantom refs based on project type

[fwdekker]

#136 enabled the creation of phantom refs. However, phantom refs are not necessary for some types of projects (e.g. JavaMavenProject). Therefore, this functionality should be toggleable based on the type of project.

[casperboone]

What's the advantage of not having phantom refs turned on for certain project types?

[fwdekker]

Because users may want integrity and will therefore prefer Schaapi to fail if there are missing classes.

I think my suggestion of five months ago can be updated by changing it to a command-line parameter that allows users to toggle phantom refs. I think it would make most sense if the enabled state would be the default.

I don't think this has a high priority at all.