Implement Syncback to support converting Roblox files to a Rojo project (#937)

This is a very large commit.
Consider checking the linked PR for more information.

rojo-test/syncback-tests/project_reserialize/expected/default.project.json

@@ -0,0 +1,29 @@
+{
+  "name": "project_reserialize",
+  "tree": {
+    "$className": "DataModel",
+    "Workspace": {
+      "attribute_mismatch": {
+        "$attributes": {
+          "foo": "bar"
+        },
+        "$path": "attribute_mismatch.luau"
+      },
+      "property_mismatch": {
+        "$path": "property_mismatch.project.json"
+      },
+      "$properties": {
+        "EditorLiveScripting": {
+          "Enum": 0
+        },
+        "SignalBehavior": "Deferred",
+        "StreamOutBehavior": "Opportunistic",
+        "StreamingEnabled": true,
+        "StreamingIntegrityMode": "PauseOutsideLoadedArea"
+      },
+      "$attributes": {
+        "Rojo_Target_CurrentCamera": "6d6ae1d713c82fae0620aa1300000375"
+      }
+    }
+  }
+}