* Keyframe lines were being drawn too short when frame number box was
enabled. The code for drawing this was modifying the View2D view-space
to get it's stuff in the right place, but the timeline code was not
accounting for this.
* In order to make the time ticks more visible outside the frame
range, I've moved the start/end frame drawing stuff in timeline to
occur after the grid drawing, and to draw semi-transparent, just like
the preview range curtains in the other animation editors
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