FlightGear - Flight Simulator FGAddon

- enable 8.33 kHz radio's (C++ bug disables R radio panel for the moment, but should be solved soon). Shift-scrolling the center button in-/decreases the frequency with 100 kHz intervals, for quicker frequency selection. Tooltips can be disabled from the Aircraft settings dialog.
- Add option to save fuel level between sessions, default is disabled, can be enabled from the Aircraft settings dialog.
- Added Aircraft settings dialog (basic dialog, will become the base for future persistent Aircraft settings).
- Enable YASim 2018.1