Input system update

Completely reworked the internal input system to provide better controller compatibility and easier controller calibration.

This will be most noticeable on Windows machines. Now you should no longer need to set up special endpoints for radios such as the FrSky Taranis etc. You should now be able to simply use a standard default model setup on your radio (which is especially helpful on some radios which does not have a screen).

After updating you will probably need to go through the Calibrate Controller procedure in the simulator again. Sorry for this inconvenience. (It is inevitable since the internal workings of the input system is now completely different). If you have previously needed to use a model with modified endpoints, it is now recommended to going back to using a standard default model setup. That will most likely give the best calibration.