Single player character collisions

[tritonas00]

Single player character with actors collisions. New option added in top menu bar.

Demo: https://streamable.com/gttxum

[tritonas00]

To do: Make AI vehicle ignore the collided character or else if it stands too close in the front, it will try to avoid and turn, in Normal mode.

[ohlidalp]

Closing this in favor of #3050 because there's a common issue - character slides when the vehicle turns - and I'm crafting a common fix.