Added some Position particle initializers from CS:GO
* Position Along Ring
* Position Along Epitrochoid
* Position Modify Place On Ground
* Position From Chaotic Attractor
More particle operators & changes
New initializers:
* Scalar Random
* Vector Random
* Vector Component Random
* Set Hitbox to Closest Hitbox
* Set Hitbox Position on Model
* Velocity Set from Control Point
"hitbox" and "hitbox set" parameters added to:
* Position on Model Random (initializer) - also `hitbox scale` is now `model hitbox scale`
* Movement Lock to Bone (operator)
* Cull relative to model (operator)