Option to gently fade chaperone to disabled below a certain height #622
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Wow, I found time to finish it!
When I play VR for extended periods, I usually play in one of two ways - standing up or sitting down, either on the floor or on nearby furniture. The furniture presents a problem though, as I usually have to go and disable my chaperone manually when sitting to have a good experience, then re-enable it manually when standing up again.
These changes add a simple feature - when the user's head ducks below a (configurable) height for more than 5 seconds, slowly fade the chaperone distance (originally opacity, but that didn't work) down to 0.0f, effectively disabling it.
Since this feature conflicts with the disable and fadedistance features, they're disabled in the UI when it's enabled. The fadedistance when 'standing' is hard-coded to 0.4f for now.