Collection of tasks for 3D particle tech preview for Qt 6.1

Things needed from 2D API:

• Emitter
• Attractor
• Particle
• TargetDirection
• Age
• TrailEmitter?
• Turbulence?
• Friction?
• CumulativeDirection?
• Wander?

Requirements:

• Possibility to run particles with timeline (back and forth, with different speeds)
• Ability to control number of active particles (i.e. Age also controls freeing memory)
• Instancing may be slower, should using it be forgotten?
• Types of particles
  • direct RHI
  • one that uses everything Quick3D throws at it
  • (+ point + static + images as rect & texture?)
• Sorting needs to be taken into account, if necessary (as a togglable property)
• Stateless, but these cannot be affected by affectors?