[PR] Adds the Syndicate Wet Floor sign

[subjectparfait]

Making it essentially unremovalbe like that would make it a much more expensive traitor item imo.

Well Kudzu and Power sinks are also difficult to remove, but have more global effects on the station than just 1 room. 

Compared to the 4 and 5 telecrystal cost of those I thought 3 was fitting, which is what a wet floor sign + agent card adds up to. I think there's a neat design to a traitor item which gets more functions if you also have an agent card.

the wet floor sign could be extremely deadly with proper placement ie at cog 1 escape you could place it in a way where people would get slipped out of an airlock