Map axes to buttons

[chlorate]

Each axis would correspond to up to two "virtual" buttons (not sure on the terminology). E.g, "Axis 1+" would be considered pressed when Axis 1 is pushed in a positive direction and "Axis 1-" would be pressed when pushed in a negative direction.

Virtual buttons would appear in the Controller tab and collect statistics like normal hardware buttons. This is also how the d-pad buttons currently work.

Virtual buttons would only be created if an axis can be pushed in a direction. E.g., if an axis' range is 0 to +1 and its neutral is 0, then it cannot be pushed in the negative direction and so only a positive button is created.

There should be some threshold so that very small movement doesn't create a button (e.g., has to be more than 0.1 units away from neutral).