Fix turbulence post rework

[QbieShay]

Turbulence wasn't correctly altering the velocity vector which caused flickering with interpolation and disruption of the noise pattern.
Additionally, scale for 2D is now more usable in the inspector.
Soft compat breakage with existing 2D particles that use turbulence.

Video of the visual change:

2023-10-28.11-40-12.mp4

2023-10-28.12-24-12.mp4

[QbieShay]

After having a conversation with @RPicster , we decided to move the scale changes out of this PR.

[clayjohn]

I don't really have enough knowledge about the turbulence code to give a substantive approval. The code changes look fine to me and I don't think they will have unintended consequences in other parts of the code.

What I can't say is whether the behavioral change is desirable or aligns better with how things worked in 4.1.x.

Would be helpful to have @RPicster's approval as well

[QbieShay]

More detail on what was happening:

The turbulence change of direction was applied only to the combined value of animated velocities and velocity, but velocity was never updated. This was causing the interpolation code to flicker the particle back and forth. Additionally, this was "holding back" the turbulence from properly forming patterns because the particles were constantly pulled in different directions.

[akien-mga]

The commit message should be amended if it no longer includes scale changes.

[akien-mga]

Thanks!