This is a monochrome icon set, with a more modern look and icons for various features that did not have a proper icon before.
Currently only for simple commands like play, add, zoom, expand, etc.
This patch adds icons for each of the keyframe interpolation types (including the easing equations), as well as icons for the easing type options. Icons made by: Paulo José Oliveira Amaro (pauloup) Reviewed by: Joshua Leung, Thomas Beck
