Sets the entity's model sequence.
If the specified sequence is already active, the animation will not be restarted. See Entity:ResetSequence for a function that restarts the animation even if it is already playing.
In some cases you want to run Entity:ResetSequenceInfo to make this function run.
Will not work on players due to the animations being reset every frame by the base gamemode animation system. See GM:CalcMainActivity.
For custom scripted entities you will want to apply example from ENTITY:Think to make animations work.
Set the entity to play the "idle" sequence.
Set the entity to play the first sequence defined on the model (usually idle).