FPV Freerider demo

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- Now uses the new Expo and Superexpo curve system (which is fixed in this demo but fully adjustable in the full version)
- Ability to choose the amount of deadzone for USB input - large, medium, small, off (in the main menu)
- 64 bit support
- Fixed a couple of issues in the last release

(The new app permissions requested are because Unity (the engine used for development) automatically adds them, FPV Freerider itself doesn't need any special permissions)