Missing AcquireGimbalControlPopup

[gillamkid]

In this PR (#11264), there was some logic added where certain gimbal actions will check if the Gimbal is acquired by someone else before commanding the gimbal action. If the gimbal is currently acquired by someone else, a showAcquireGimbalControlPopup signal gets emited. A comment says this is expected to be handled by QML. The problem is there is no such QML handling the signal

@Davidsastresas looks like you added that code. I assume you have a fork with the QML handler in it. Can you bring that to upstream?

[Davidsastresas]

Hi Guillamkid. I took a quick look, and indeed that handler is missing, or maybe never implemented in the first place. Back when I did this with Julian it went through a lot of iterations, and maybe we missed that one. Feel free to make a PR, I will be happy to take a look.

Best regards!