Implement remaining missing functionality (file menu, templates)
Remove old Utility.Projects.SetActive(), error if setting non-gamemode project
Fix NRE when launching projects through jump list
Use direct path to project through jump lists instead of addon ident
We can add the project manually if it exists but we don't know about
it (can happen if you pin something on the jump list, then remove it
from registered addons list, and then try to launch the pinned addon)