RSyntaxTextArea: Change to version 2.5.2

I've updated the code involving RSyntaxTextArea to use the 2.5.2 API. The
changes involved:
- Change version in POM
- Interrogate SearchResult object for return values in
  FindAndReplaceDialog.
- Update TokenFunctions to use new API calls.

Signed-off-by: Luke Stuyvenberg <stuyvenberg@wisc.edu>