Rewrote CVT library into a DVR framework == New Library CVT_DVR

This uses DVR instead of FGV.
Also attempted to optimize both CVT & CVT_DVR Libraries for speed.
Also made changes in execution to GetRef VIs and VartoDataType VIs to speed them up.

Lots of changes...but should not break any existing files
Update .version, README.txt, and ChangeLog.txt for Tools1.3.0