Video support

We now support video as a media. Just like images, you can import a video in your project and animate its basic properties. We currently support the MP4 format, and videos under 100MB.

Other improvements and fixes

• We added some animation presets to simplify the creation of classic animations
• Animation parameters are now expressed in terms of absolute values (instead of relative)
• We now use the original file name to identify an image in the layer list
• Selecting an element in the layer list now highlights its animations in the timeline, and vice versa
• The timeline height is now capped to leave more space for the canvas
• You can now reorder animations in the timeline
• New animations are now added at the bottom of the timeline
• The UI elements displayed on the canvas are now hidden while playing an animation
• Fixed a bug about the selection box that would not fit the object
• Fixed a bug about resizing objects with a Move animation