Mesecons

Enable mesecons for homedecor doors and gates, and in theory trap doors (there aren't any)

This allows pressure plates to open and close them.

This also fixes the bug where right opening doors were giving the opposite sound when opened or closed.

Should do a fairly good job of figuring out whether doors already placed are open or closed. Doors will always be placed as closed. Punching them resets them to uh, open.