v3.8.22: Fixes

• build: building now faster and better compatible
• fix[Easing]: Easing on reverse fixed
• fix[RollupConfig]: config-file fixed
• fix[Seek]: not works best, but works at least
• compatibility[UI]: making it better compatibility for better
• fix[stop]: stop method fix
• feat[Easing]: stepped easing added
• feat[Selector]: making API public
• docs[API]: update
• fix[packageJSON]: now returns unminified
• format[Code]: code formatting fix
• break[Timeline]: now elapsed() is progress()
• and some fixes, improvements and patches...