fixed umbrella header for stats added error-feedback to wifi optimizers improved logging for wifi optimizers adjusted calling-API for wifi-optimizers
- some should be the same as previous commit (sorry!) - some should be new: LINT checks, ...?
some new helper methods added listener-support to offline-reader
added corresponding test-cases switched to newer version of tinyxml due to some issues adjusted affected code-parts accordingly for better re-use, moved ceiling-calculation to a new class some minor fixes new helper methods worked on wifi-opt
