4.0.0b3

Added

• Added preliminary BTstack support for EV3 (pybricks-micropython#405).

Changed

• Make 3D orientation default for heading and drivebase heading control (support#1962).
• Improved color detection when using default colors. Also changed the HSV calculation
  for the SPIKE Color Sensor and Boost Color and Distance Sensor to make them
  more similar. User code should measure HSV values again in old code (pybricks-micropython#421).

Fixed

• Fixed race=False ignored in pybricks.tools.multitask(). (support#2468)
• Fixed Essential Hub button being disabled after power off so it could not be
  switched on again.
• Fixed TechnicHub class being unavailable on Technic Hub in a recent
  pre-release (pybricks-micropython#425).