moved Aardvark.Data.Opc QTree to old Aardvark.SceneGraph.Opc namespac…

…e to prevent deserialization issues in legacy data. This seems controversial but a good tradeoff, trust me.

src/Aardvark.Data.Opc/PatchFileInfo.fs

@@ -206,11 +206,18 @@ module PatchFileInfo =
         let doc = Prinziple.readXmlDoc path
         ofXDoc doc patchName true
 
+namespace Aardvark.SceneGraph.Opc
+
+// in the old namespace to enable deserialization in (pickler) caches without hurdles.
 [<RequireQualifiedAccess>]
 type QTree<'T> =
     | Node of 'T * QTree<'T>[]
     | Leaf of 'T
 
+namespace Aardvark.Data.Opc
+
+open Aardvark.SceneGraph.Opc
+
 [<CompilationRepresentation(CompilationRepresentationFlags.ModuleSuffix)>]
 module QTree =
     let rec map (f : 'T -> 'U) (tree : QTree<'T>) =