Animation Export multithreaded

[RobertGrahamJR]

Make the Export of Animations to video files multithreaded.  It takes too long to export high-resolution videos.  Adding a temporal dimension to geographic data brings out phenomena that is not apparent in a still image.   Making the export of animations faster will increase the use of this medium.  Take advantage of GPU and multiple cores on the desktop or GP servers. 

[jfisher]

Just tried it out today for the first time. Probably won't be using it too much due to export speed. Need better documentation for fly-through from line. But this would be very useful for collaborating with non-Gis users on a major roads project.