6.0.0-0

A library rewrite that introduced some benefits:

• Improved app performance for user-visible tasks because we always use MessageChannel.postMessage() and this way we ensure scheduled tasks are run at least once per frame.
• Improved performance consistency by measuring tasks execution time from the first completed yield and not from the start of the frame.
• More future-proof. The new implementation will allow some new future features be implemented easier.

v5.0.1...v6.0.0-0