Adds emoji to OOC chat [Now with in-house sprites!]

**Adds emoji to OOC chat, and config option to enable it. It's enabled by default**


![](http://i.imgur.com/CjNQhMx.png)
Here we see the poor defenseless ian being hunted by the traitor AI and his bots, who knows what that devious computer has in store for him!

#### Current available emojis, by Nienhaus:

 * happy
 * sad
 * mad
 * cat
 * reallyhappy
 * superhappy
 * surprised
 * face
 * toolbox
 * wetfloorsign
 * paper
 * paperwrote
 * id
 * ian
 * head
 * bluetank
 * capgun
 * ai
 * toysword
 * clean
 * tile
 * medbot
 * thelaw
Do we want adminPM's to handle emoji?

Either way this should check the config option first.