add protocol specific smileys
Submitted by Nicolò Chieffo
Link to original bug (#583542)
Description
I request to add protocol specific smileys: msn has lots of smileys that are currently not handled.
Also custom smileys (if supported by the protocol) should be used, either when you send it (so this requires a way to set a custom smiley) or receive it (and this requires to implement the image retrieval)