Wrong item length calculations if playrate != 1

[Benjamin Klum]

Effects:

• Edit clip: Extends to wrong length
• Preserve item cut on import: Glues when not necessary, doesn't glue when necessary
• Retriggering: Retriggers when not necessary, doesn't retrigger when necessary

[Benjamin Klum]

re #113 Edit clip: Fix extension to wrong length if playrate != 1

→ <<cset a558d23796dd>>

[Benjamin Klum]

re #113 Preserve item cut on import: Fix incorrect glue decision if playrate != 1

→ <<cset 57c75708e287>>

[Benjamin Klum]

re #113 Retriggering: Fix incorrect retriggering decision if playrate != 1

→ <<cset 9ff4bd9bf1ac>>