Support fields that are written in the @Ignored annotation in the UnmappedTargetPropertiesInspection #237

With MapStruct 1.7.0 it is possible to provide ignored arguments with the new annotation @Ignored:

• Allow ignoring multiple target properties mapstruct#1958

The UnmappedTargetPropertiesInspection needs to consider them, else we would get false warnings.

This can already be implemented before 1.7.0 is released.