Manage Menu: Sort dropdown items by Resource and Graph

[mradamcox]

It would be easier to use this dropdown if its contents were sorted in the same manner as the Find dropdown on the Resource Designer front page.

[mradamcox]

For clarification, this is the menu

that I'm proposing to be made to look like this menu

[mradamcox]

The reasoning is that the name of a resource model or branch may not give any indication of what category the item falls into.

[jmunowitch]

In the new Graph Designer in 4.3, this is implemented:
Duplicate of #3553