#538 'Clean project' does not remove all auto-generated files

[Jannick]

Example: Project with file a.y, hence auto-generated files a.parser.c and a.parser.h (as given in precompiler rule in the advanced compiler options). Issue: After cleaning the project a.parser.h still exists, while a.parser.c is removed.

Expectation: a.parser.h - together with all other auto-generated files are removed.