Improvements and fixes

This release is mostly about consolidating what we shipped in the previous weeks.

• Improved the graphical editing of Move action
• Added an arrow head to represent the direction of the Move actions
• Display the size and angle information near the mouse cursor when editing graphically
• Improve responsiveness when dragging the time cursor in the timeline
• Fixed a bug on the Resize action, where the object would sometimes jump
• Shortened the export page URLs