Phase out HsImportMatcher

[rlaemmel]

Now that we have HsFactExtractor with coverage of facts for imports, it looks we could just wipe out HsImportMatcher and write a stupid Python script to perform import matching, essentially just as we do anyhow for Java.

[martinleinberger]

This script would look exactly like the one for Java. Therefore, it would be better if we "generalize" the existing one.
And I guess "generalizing" in this case means that we need to change the name and the location of the script plus the predicates in the Haskell technologies.