XCTrack for PC

* New maps styles
* Simple road map download
* Webpage widget (PRO):
* Allow tapping on locked widget for easier in-flight interactions
* JavaScript interface for XCTrack data (for webpage developers)
* Widget add: New filtering of the widget list through text search
* New last notification widget
* New display brightness reactions
* New sensor: Vector Vario
* Support for new features from external sensors: Air temperature and humidity
* Improved process of flight upload to XContest