[WIP] [DO NOT MERGE] Saycode rewrite

HIGHLIGHTS:
* All atom/movables can talk and hear!
* Hear() proc added to remove shitty typechecking!
* mob/living/say() is no longer a monolith!
* Removal of duplicates, copypasta and typechecks!
* HEAR flag to determine wether things can hear!
* Languages are bitflags instead of typechecks!
* Faster recursive checks!
* ALL and NONE #defines for bitflag convenience!
* Almost all saycode bugs fixed!
* Removal of the unused silicon/decoy type!

Fixed #699 
Fixed #686 
Fixed #333 
Fixed #3347 
Fixed #263 
Fixed #1420
Fixed #149

Fixed #950 (Considering that this is a complete rewrite, it's probably safe to close this issue, and if it were to happen again it could be re-opened)
Typing four symbols is easier.
Op 17-aug.-2014 23:48 schreef "Orange Borg" <notifications@github.com>:

> In code/game/objects/items/devices/radio/radio.dm:
>
> >
> >
> > -
> > -	else // OLD RADIO SYSTEMS: By Goons?
> > +	/*else // OLD RADIO SYSTEMS: By Goons?
>
> Do you not have a delete key ?
>
> —
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> <https://github.com/tgstation/-tg-station/pull/4337/files#r16332356>.
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