v0.12.1

Added

• oxframe inspect lists each shader node's numeric parameters (amp,
  wetness, …) and the strength and speed of an effect, under params.
• Guide lessons 11 to 13 as examples: scenes and transitions, sound and
  voice, shaders and effects.
• The ocean example: the target scene of hybrid rendering.

Fixed

• check reported dead_time while a shader parameter or an effect was
  animating, such as a growing wave or a wetting lens. Those changes now
  count as motion.