Add World collision toggle shortcut key

[SilverfishVR]

Currently, the default way of changing your world collision setting requires you to navigate to the Avatar setting menu, which is a sub-menu to the Avatar menu, a bit deeply Buried and difficult to explain to a new user stuck in a wall.

I have had it mapped to "v" for the best part of 2 years now, not sure why I chose "v" but I've had no issues with other apps using "v" so I suggest making "v" the default world collision toggle key.