Most items in the Asset menu grey out after right-clicking and calling out the menu in Project window/tab.

To solve this, right-click in the Project window again and use "Import Package -> Custom Package..." then choose a package to import, or re-launch the project.

Repro:
1. Create a new project
2. Click on the Asset menu item. Everything should be available.
3. Right click in the Project window to call out the menu.
4. Open the Asset menu in the menu bar again and observe
optional:
5. Right-click in the Project window/tab and choose to import a custom package
6. Open Asset menu in the menu bar again.

Expected: Asset menu items are available.
Actual: Asset menu items grey out after right click in the Project window.

Note: this bug may be related to 1069004

Happens to: Trunk build (2019.1.0a1)