Adds PASSEMOTES flag to setup.dm, dionaea and borers.

Conflicts:
	code/modules/mob/living/carbon/monkey/diona.dm
	code/modules/mob/living/simple_animal/borer.dm
Cleaned up holders a bit, added show_message() proc to them, added loops in custom_emote to show emotes to things in inventories with the right flag.

Conflicts:
	baystation12.dme
	code/modules/mob/emote.dm