+ Implemented: Lab Point3 and Position controller plugins

* Patched: Error during graph loading with incorrect port groups (though I haven't determined what causes this)
* Fixed: .ctx files are incompatible between different builds (on different machines)
* Fixed: Inconsistent results when trying multi-segmented plane example (defect 1984)
* Fixed: Copying/pasting a graph made from template will paste an empty node
* Fixed: Integer-based spinners properly increment/decrement values