PolygonEditor

Reopening this: 
https://github.com/vvvv/vvvv-sdk/pull/199

-Cursor (DX9) and Drag (Value) have been removed from PolygonEditor, and seperately added to the addonpack.

-The helppatch is fixed

Renamed subpatches as discussed. They are now called 'Feature (PolygonEditor)', and SplitData/JoinData is now called PolygonEditor (Split/Join).

Also changed the logic of OnlyOneTrue, to be one file instead of two different ones for Vertices and Polygons, and also to be possibly usable outside of PolygonEditor.

Still have to do the renaming of all Pins, so the word Shape is gone everywhere (we are dealing with Polygons, which is more specific than shapes; also, most of the time it's obvious that we are dealing with properties of Polygons (like Polygon Vertex Count etc.), so it can and should be left out altogether to avoid doublestatements).