Astronaut Movement and emote additions

I suggest the following additions to Astronaut movements: Ladder use, stair use (might need actual stair and ladder parts for this, implementing this on custom made ladder parts would be really hard)

Emotes: Sitting, Laying Down (for sitting in a cockpit chair or laying down in a bunk). Other assorted emotes might be nice, like waving, salute, happy, sad, excited, Dance (maybe the robot) and other simple emotes like that.