Implement merge-mode key-frame selection and interpolation #46
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This PR only adds merge mode . This is often needed when annotating continuous segments from a video if an object follows a predictable, linear motion. Merge mode is done by pressing backtick ` and then double clicking an existing mark, then navigating to another frame (either before or after the frame, because both forward and backward interpolation is supported) and double clicking another mark.
New marks are generated between the two. This "merges" the marks.
(maybe interpolate mode is a better term?)