Flight Instruments 2.0.1

Rewrote much of the code.

• Added automatic sea level detection and removed the "set sea level" button. The size of the app has changed as a result and you may need to readd/reposition it.
• Instruments should respond much more smoothly. The vertical speed instrument/variometer also has a slight amount of delay (on purpose).
• Changed the UI text design; instrument values are now shown monospaced.
• Instruments should now be more reliable when e.g. showing/hiding UI.
• Rotated the displayed heading by 180 degrees to align with builtin maps.
• Added support for reordering instruments. There is no UI for this, so it must be done manually by editing setting files (see the mod description for instructions). I will look into how an UI could be implemented.
• The vertical speed instrument/variometer should now work in replays. (Unfortunately the instruments do not update for inactive vehicles, so they get stuck in replays. Seeing as this also affects the builtin apps, this is a BeamNG restriction and I'm not sure what can be done about it.)
• The filename has been converted to lowercase for better functionality on case-sensitive file systems (i.e. Linux). This should not have any real effect on Windows.