Implement isTouchActive and deactivation of ray-renderer

[HalfdanJ]

Currently in magic window the ray stays at the last position pressed, resulting in selection of meshes when there is no touch.

This PR does:

• Adds getIsTouchActive on ray-controller, is true when there is a touch event happening
• Deactivates the ray renderer on touchend, and deselects any selected meshes.
• Added check that filters out mouse events if there are touch events (since mousemove is called on mobile and confuses the message)

[borismus]

Thanks for this. Will tweak some of the code comments (they should end in a period).