removed duplicated code in World to handle member arrays
moved viewport to view subfolder
moved camera to view subfolder
moved canvas to view folder
renamed scenes folder to scene
moved scene to subfolder scene
made spring ground and pressure ground moving
added wip implementation of fullscreen using screenfull
added toString method to BitMask
added additional Bitmask property for x-axis in Body
added Grid to Jello in order to enable bitmask-based early outs in
narrow collision check
added Grid to World
removed worldLimits in World