This command would work similar to `setUnitCombatMode`: https://feedback.bistudio.com/T152965
i.e. instead of operating on the unit group like `setBehavior`, it would operating on the unit itself:
Old command syntax:
`group setBehavior behavior`
New command syntax:
`unit setUnitBehavior behavior`
Thankfully, there's no need for a `unitBehavior` command, because the `behavior` command works fine on individual units as well (unlike `combatMode`)