Loiter item cleanup

[snorkel123]

• When "Loiter" item in Mission Editor is chosen, it immediately closes and Waypoint is shown instead.
• When "Loiter Indefinitely" item in Mission Editor is chosen, it simply closes and when I try to press on this newly created item, it does not open

[arthurbenemann]

Loiter is an abstract mission item and should never have been placed there in the first place. On the release and beta branches it's disabled.

I agree with your comment, we should really make master get as closer to the release as possible.

[m4gr3d]

@arthurbenemann from previous conversations, you mentioned removing Loiter and Loiter Indefinitely from the master branch. Any updates on that?

[arthurbenemann]

Removed Loiter and Loiter Indefinitely in #1140