Add a grid pattern overlay feature to QField's QML camera #4745
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This PR implements a grid overlay to QField's QML {still,video} camera. I've always found such a functionality super useful when trying to take technical photos. The overlay can be turned on/off via an overlay button located at the top left corner of the screen.
Screenshot time:
With that in, as well as the recent geotagging functionality, I'm wondering whether we should switch the default camera back to the QML camera. People have reported the memory saturation crash gone when using the QML camera. Food for thoughts.
(Edit: forgot to mention the commit also fixes an issue with the capture/record button overlapping the system's bottom margin within which we shouldn't have anything interactive)