Blender Git Loki

Bugfix #21117: Trying to select overlapping keys in the graph editor only cycles through top two keys
(A masterclass in killing a bug using a sledgehammer...)

Recoded the way that Graph Editor keyframe selection works, replacing the old penalties + closest vert system with a selection queue.

Perhaps the sensitivity tolerance for picking up when a vert is clicked on is too sensitive now, but this can be fixed easily.