PFD QML: Fix over sensitive pitch on artificial horizon
Mission Elevation Widget: Add Google Elevation data graph 

+ Extra UI improvements
Merge remote-tracking branch 'upstream/master' into 274
Graphing: Fix #380, Don't try to create the same table twice if a second message format packet is encountered
Comms: Added functionality to add new links in advanced mode, including TCP Links
Comms: Current links are now saved, and restored on start.
Comms: Added some reasonable defaults for invalid serial port baud rates
Stylesheets: Fix #381, menu items not having mouse-hover backgrounds in outdoor mode
Elevation Widget: Fix not showing error dialog on no internet connection
Elevation Widget: Improve handling of when elevation map needs to be refresh
Elevation Widget: Add markers and resolution inidcators
Elevation Widget: Add waypoint Labels
Copyright: Fix files to explicitly state copyright
Toolbar: Fix for port/baud buttons on toolbar not detecting initial settings
GraphView: Fix #228, filter loadable logs by file extension in the UI, to avoid users attempting to open the wrong file type
Comms: Fix for COM port not being saved in settings when changed
Merge remote-tracking branch 'upstream/master' into 274
Comms: Fix for UDP/TCP links not correctly sending bytes and emitting connect/disconnect messages
Graphing: Fix for timestamp being wrong in live graph mode
Comms: Fix for Link name not updating the menu item