Merge pull request #272 from virtual-world-framework/Ken-Art

Ken McClure:  adding in Doug Wikes changes to the scene.  He deleted all...
Made dust more visible & more wind effect on smoke
Merge pull request #273 from virtual-world-framework/adjust-particles

Made dust more visible & more wind effect on smoke
Move status text functionality from html overlay to HUD
Address garbage collection issues with HUD status text and blockly
Merge pull request #274 from virtual-world-framework/HUD-status

Move status text functionality from html overlay to HUD
Make camera translation instant to help performance
Merge pull request #275 from virtual-world-framework/cam-performance

Make camera translation instant to help performance
Added some if-else blocks
Not quite working yet.
Sensor block working!
Added if/else blocks, added sensor block to rover, updated xml for scenario 3
Adds missing tracked file
Adds a while until block
Rebase and small adjustment to rover sensor.
Add Blockly XML
Spacing changes.
More scenarios and spacing fixes
Fixes grid initialization issues.
Working to get Graph tab to remain displayed between sub scenarios.