Update Zoom level

[Godeffroy]

trafficstars

FlightData : Update Zoom level FlightPlanner : Update Zoom level Rename trackBar1 to TRK_zoom like in FlightData TRK_zoom take min from map provider TRK_zoom take now value from Map zoom in float instead of int Add Zoom Numeric Up & Down to see Zoom level

[Godeffroy]

I could made the same layout design for the numeric up & down zoom level in Data as in Plan, just above the track bar. It's more natural to see the level as we adjust it.

[Godeffroy]

Made some small arrangement in UI, also rebased on master as FlightData has changed.

[Godeffroy]

Sorry Michael Oborne, i erased your commit with the force push, but it was for better clarity in the commit :)