extractor: minor improvements

- templateCallback: do not be a "RefactoringTool", but a "ClangTool"
  this safes the "Replace" member variable
- use "sm" as shortcut for source-manager

Signed-off-by: Martin Zenzes <martin.zenzes@dfki.de>
shit

Signed-off-by: Martin Zenzes <martin.zenzes@dfki.de>
typo

Signed-off-by: Martin Zenzes <martin.zenzes@dfki.de>
extractor: cleanup
Merge branch 'janosch'

Conflicts:
	extractor/Extractor.cpp
extractor: minor cleanups

Signed-off-by: Martin Zenzes <martin.zenzes@dfki.de>