Make effect/attribute animation icon more visible

[ivelieu]

I know about the buttons for opening the effect animation window, and how they change sprites depending on whether there is currently an animation for that effect or not. It would be nicer if the icons were higher contrast, because I have to squint to tell the minor red/green difference on the button sprite. The buttons changing themselves don't always seem to update correctly; some that are marked as red (indicating there is an animation on that frame) I can open and see there is only one keyframe set at frame 0, then I close the window and the button updates to green, so there is something wrong with the UI updates for those buttons.

This image shows that they are hard to tell apart at a distance. Maybe the red one could have a different background instead of white.