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/SSTR.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using RobloxFiles.DataTypes;
 
 namespace RobloxFiles.BinaryFormat.Chunks
 {
@@ -9,7 +10,7 @@ namespace RobloxFiles.BinaryFormat.Chunks
         public int NumHashes;
 
         public Dictionary<string, uint> Lookup = new Dictionary<string, uint>();
-        public Dictionary<uint, string> Strings = new Dictionary<uint, string>();
+        public Dictionary<uint, SharedString> Strings = new Dictionary<uint, SharedString>();
 
         public void LoadFromReader(BinaryRobloxFileReader reader)
         {
@@ -25,10 +26,8 @@ namespace RobloxFiles.BinaryFormat.Chunks
                 int length = reader.ReadInt32();
                 byte[] data = reader.ReadBytes(length);
 
-                string key = Convert.ToBase64String(md5);
-                string value = Convert.ToBase64String(data);
-
-                Lookup.Add(key, id);
+                SharedString value = SharedString.FromBuffer(data);
+                Lookup.Add(value.MD5_Key, id);
                 Strings.Add(id, value);
             }
 
@@ -49,8 +48,8 @@ namespace RobloxFiles.BinaryFormat.Chunks
                 byte[] md5 = Convert.FromBase64String(key);
                 writer.Write(md5);
 
-                string value = Strings[pair.Value];
-                byte[] buffer = Convert.FromBase64String(value);
+                SharedString value = Strings[pair.Value];
+                byte[] buffer = SharedString.FindRecord(value.MD5_Key);
 
                 writer.Write(buffer.Length);
                 writer.Write(buffer);