Modifying the Grid object so it holds the camera locations as well.
Add camera footprints overlays to the map.
Fix some problems with the size of the ground footprints.

Also some cosmetic fixes
Ups, that was an ugly math mistake :)
Re-factoring camera data
Adding the option to enable or not the polygon camera overlays.
Improving the survey fragment layout
Making the number of cameras consistent through the app.
Set the default altitude on survey be the same as the default alt.