/tg/ input stripping.

Borrows /tg/'s html stripping code.
Ghosts, and anything saying anything which is seen by ghosts, are the first to be given this boon. Ghosts now have to deliberately emote things like ````"Spooky man feel it&#39;s time to type crap"```` as ' are now properly displayed.

Was unable to make things such as ````<br>```` and `, ´, or ' to cause issues, pretty much as expected.