Remove hard requirement for moduliPath and properties tags in config

The following discussion from !4 (merged) should be addressed:

• @NicolaiO started a discussion: (+1 comment)

  ist das eigentlich immer noch required, auch wenn leer? Brauchen wir das überhaupt noch? -> dann neues issue?

The tag <moduliPath> can be removed entirely since it is never used and provides no value.