This should make animations in sequencer work again at most
places.
It removes facf0 and facf1 and replaces them by
* effect_fader (the fader position for transition effects
limited 0-1 value range)
* speed_fader (full range fader for speed effect)
Also: default transitions should work again.
Still not working: non-IPO-locked curves. (Don't really know,
if we can / want to bring them back in new animation system.)
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