Nyall Dawson bffa42ae74 Implement undo logic for streamed digitizing mode
When the backspace key is held down, points will be repeatedly
removed from streamed digitized sections, right up till the start
of the streaming section. Then the point removal will temporarily
pause until the user releases and re-holds down the backspace key.

This allows users to selectively remove portions of the geometry
captured with the streaming mode by holding down the undo key,
without risking accidental undo of non-streamed portions.
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