Take photo or video on secondary click

[meisenzahl]

Closes #55

Does exactly what the title says. Hdy.WindowHandle had to be removed to prevent that a secondary click on the camera view opens the secondary window context menu.

[jeremypw]

This works as expected - just a couple of minor comments.

Running the base handler after emitting a signal (which is not in an Idle) looks risky but no adverse effect was noticed in practice

Changes made

[jeremypw]

Code and functionality lgtm. Leaving for UX input.

[danirabbit]

Removing the window handle completely here means that the window can no longer be moved at all.

I'm also kind of -1 on trading the window handle for right click here. It seems like being able to move the window by dragging anywhere is more useful than taking a photo with a secondary click, which I'm not sure it makes sense to expect that a secondary click to preform an action

[meisenzahl]

@danrabbit I found a solution so you can take a photo or video on secondary click and we can use a Hdy.WindowHandle. Sorry I didn't think of it sooner.

[danirabbit]

Works for me! just one small comment