[MERGED PR] Mobs entering chutes: Adds actionbar and animation

[Studenterhue]

I'm in Frank Stein's boat; I think an animation of the person moving onto the chute, similar to the animation of someone moving onto a crate, would be good, however brief. I suppose shoving yourself into a chute only showing the icon to you would be a fair compromise to people who want chute-escapes to be stealthy, but I think it's kinda moot given it still has the "climbs into the chute" message.