Remove duplicate reports from UserSettings plugin

Target of this PR is to remove all duplicate reports from UserSettings plugin and migrate their data to DevicesDetection plugin (refs #3962)

What needs to be done:
- [x] forward API calls from UserSettings to DevicesDetection plugin & depreacte those API mehtods
- [x] Remove duplicate Reports from UserSettings Plugin
- [x] Update-Script: 
 - [x] Rename all UserSettings-Blobs to DevicesDetection-Blobs where possible
 - [x] Migrate / Regenerate missing Blobs (Browser + OS w/ version)
 - [x] replace widgets in existing dashboards
 - [x] replace reports in scheduled reports
- [x] CleanUp UserSettings Plugin
 - [x] remove now unused Rows
 - [x] remove unused helper functions
 - [x] remove archiving for removed reports
- [x] remove UserAgentParser as soon as it is unused
- [x] Cechk backward compatibility
 - [x] deprecated UserSettings API calls should still work
 - [x] deprecated [UserSettings widgetize URLs](http://piwik.org/docs/embed-piwik-report/) should display or redirect to new reports instead
- [ ] Cleanup translations (will be done after merging, to ensure master and oTrance are in sync)
- [x] update default dashboard to use new widget(s)
- [x] update changelog