Deprecate

• Tween: #seek method deprecated as it's not working excepted. PR are welcome (for fix without loss (or less loss) of performance)

Improvements

• Rollup: Config file change to latest after lock-file update
• Timing: while repeating it's now uses delay insteadof repeatDelay
• Timing: startTime accepts relative value to current timestamp, as replacement of delayTime (as delayTime now acts like repeatDelay too)