Dashboard release

New

• Undo and redo, convert keyframe to interpolated frame, and extend bounding box to previous frames in video bounding box labeling interface

Updated

• Image bounding box labeling interface gets a major upgrade
• Improved mouse trackability in labeling interface
• Made it easier to draw bounding boxes at the border of images and videos

Fixed

• Label myself button now keeps up to date
• Edit output interface now uses the right frames per second value in video bounding box