New browser engine reports based on new browser engine detection of DeviceDetector

*First step of removing old UserSettings stuff (refs #3962)*

- updates DeviceDetector to latest version (and adds missing browser/os icons)
- old BrowserType reports (UserSettings plugin) has been removed / replaced with new browser engine reports in DeviceDetection plugin
- those reports will be much more accurate as before the detection was only based on a browser name > browser engine mapping
- browser eninge is now stored in a new db field
- browser engine is also available for segmentation
We will not remove all UserSettings blobs. Some stuff like the browser plugin reports will remain. Or was it planned to move everything to devicesdetection plugin?
I'd like to clean up now, as otherwise we might forget it later...