* Use learnings from touch events in Blockly and apply to the Ev3 sim. Register move and up events on the document rather than the individual element allowing users greater flexibility where they move their mouse once it's down.
* Add mouse leave events
* support for IR proximity
* fixing build issue
* missing break
* remove auto-start of sensor
* setting mode on onEvent
* flooring slider value
* bump up proximity
* fixing threshold blocks