Large scale refactor to add class support!

Instance classes are now strongly typed with real property fields that
are derived from the JSON API Dump! This required a lot of reworking
across the board:

- Classes and Enums are auto-generated in the 'Generated' folder now.
This is done using a custom built-in plugin, which can be found in
the Plugins folder of this project.
- Property objects are now tied to .NET's reflection system. Reading
and writing from them will try to redirect into a field of the
Instance they are bound to.
- Property types that were loosely defined now have proper data types
(such as Color3uint8, Content, ProtectedString, SharedString, etc)
- Fixed an error with the CFrame directional vectors.
- The binary PRNT chunk now writes instances in child->parent order.
- Enums are now generated correctly, with up-to-date values.
- INST chunks are now referred to as 'Classes' instead of 'Types'.
- Unary operator added to Vector2 and Vector3.
- CollectionService tags can now be manipulated per-instance using
the Instance.Tags member.
- The Instance.Archivable property now works correctly.
- XML files now save/load metadata correctly.
- Cleaned up the property tokens directory.

I probably missed a few things, but that's a general overview of
everything that changed.

BinaryFormat/Chunks/PRNT.cs

@@ -27,21 +27,21 @@ namespace RobloxFiles.BinaryFormat.Chunks
 
                 Instance child = file.Instances[childId];
                 child.Parent = (parentId >= 0 ? file.Instances[parentId] : file);
+                child.ParentLocked = child.IsService;
             }
         }
 
         public BinaryRobloxFileChunk SaveAsChunk(BinaryRobloxFileWriter writer)
         {
-            BinaryRobloxFile file = writer.File;
             writer.StartWritingChunk(this);
 
             Format = 0;
-            NumRelations = file.Instances.Length;
+            NumRelations = 0;
 
             ChildrenIds = new List<int>();
             ParentIds = new List<int>();
 
-            foreach (Instance inst in file.Instances)
+            foreach (Instance inst in writer.PostInstances)
             {
                 Instance parent = inst.Parent;
 
@@ -53,6 +53,8 @@ namespace RobloxFiles.BinaryFormat.Chunks
 
                 ChildrenIds.Add(childId);
                 ParentIds.Add(parentId);
+
+                NumRelations++;
             }
 
             writer.Write(Format);