Blender Git Loki

Fix for [#24092] F-Curve Cycle doesn't behave properly at end of Cycles (also: possible problem with how the cycle range is determined)
* Cycle code had difficulties handling the transitions from one cycle iteration to the next one.
* Now the transition frames are handled manually so that:
- cycles before the actual fcurve data respect the first datapoint
- cycles after the fcurve data respect the last datapoint
* Also fixes a bug where the count of "before" cycles was off by one from the given value.