fix(codegen): Adds codegen for embedded objects and timer fields (#686)

* Adds code genning for embedded objects. See `AquariumState` as an example.
* Adds code genning for fields that are `Timer`. See `Aquarium` as an example.
* Codegens aquariums
* Fixes missing option for most primitive field types.

Projects/UOContent/Migrations/Server.Items.Shell.v0.json

@@ -0,0 +1,5 @@
+{
+  "version": 0,
+  "type": "Server.Items.Shell",
+  "properties": []
+}