Upgrade to rbx_dom_weak 2.0 (#377)

* Mostly mechanical port bits

* Almost there

* It builds again!

* Turn on all the code again

* Tests compiling but not passing

* Stub work for value resolution

* Implement resolution minus enums and derived properties

* Implement property descriptor resolution

* Update referent snapshots

* Update unions test project

Using a place file instead of a model yields better
error messages in Roblox Studio.

* Add easy shortcut to testing with local rbx-dom

* Update rbx-dom

* Add enum resolution

* Update init.meta.json to use UnresolvedValue

* Expand value resolution support, add test

* Filter SharedString values from web API

* Add 'property' builder method to InstanceSnapshot

* Change InstanceSnapshot/InstanceBuilder boundary

* Fix remove_file crash

* rustfmt

* Update to latest rbx_dom_lua

* Update dependencies, including rbx_dom_weak

* Update to latest rbx-dom

* Update dependencies

* Update rbx-dom, fixing more bugs

* Remove experimental warning on binary place builds

* Remove unused imports

test-projects/enums/default.project.json

@@ -0,0 +1,12 @@
+{
+  "name": "enums",
+  "tree": {
+    "$className": "DataModel",
+
+    "Lighting": {
+      "$properties": {
+        "Technology": "Voxel"
+      }
+    }
+  }
+}

test-projects/unions/default.project.json

@@ -1,6 +1,12 @@
 {
   "name": "unions",
   "tree": {
-    "$path": "src"
+    "$className": "DataModel",
+
+    "Workspace": {
+      "TwoParts": {
+        "$path": "src"
+      }
+    }
   }
 }