Adjustable FoV an TV Cams

[Vini]

I suggest the following for the TV Cams:
Mode 1 - just like now, FoV defined by track creator in cfg
Mode 2 - Initial FoV for each cam is read from cfg but user can zoom in or out
Mode 3 - Initial FoV is read from cfg but if user zooms manually the FoV value is remembered and not reset for the next cam