test/ebnf.py: `\~` is now substituted by mangled whitespace in regular expressions for _skip and _resume

- DHParser/ebnf.py: semantics for string-arguments of _skip and _lookahead directive. Will automatically be considered as lookahead

- DHParser/parse.py: resume and skip directives now jump to the reentry-point right after the match of the regular expression for re-entry

- Griechische Wörter als solche auszeichnen (damit sie später als nicht kursiv gekennzeichnet werden können)

- configuration presets refactored in order support multiprocessing start methods "spawn" and "fork-server"

- examples: replaced "report=True" with "report='REPORT'" when calling testing.grammar_suite in all tst_*.py-scripts

- scripts/dhparser.py, dsl.py: code-templates are now read from template files in templates-subdirectory