AframeActionController work arounds

[AaronSil]

While working on the aframe specific ActionController I've encountered a problem with "mousedown" events, where three event objects are fired while distributing the information about button clicked and entity clicked to the second and third object. Check https://github.com/AaronSil/Getaviz/wiki/CanvasActionController---Work-arounds for a detailed description of the problem and the solutions I've found.