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/nested_projects_weird/input-project/client-only.project.json

@@ -0,0 +1,9 @@
+{
+  "name": "client_only",
+  "tree": {
+    "$path": "src/modules"
+  },
+  "globIgnorePaths": [
+    "**Server**"
+  ]
+}