Added an infix control character to stop the bot from pinging users

This fix will make it so nicknames don't ping IRC users. It adds an invisible character after the nickname's firts character. After trying a few characters, \u0081 seemed the most stable (zero width space has poor support it seems, although this is the character you're supposed to use). Unfortunately, Minecraft doesn't have a proper empty glyph for this, so I can't just alias my nick as N\u0081ickname, hence this fix. Hopefully this PR will inspire you to put a proper implementation in EiraIRC :)

Thanks for all the great work btw, we're loving your mod