Indicator also has same visibility as the owner, so no magicaly sensing where someone is going to talk soon (chat bubbles works well enough)
Since images do not have visibility, had to make it an object decal. Also since it's set per mob, it's no longer global. Shouldn't really be much of an issue, since it's only created when mob tries to speak (so ~60 objects total on high-usual load)
Now indicator will disappear if for 30 seconds contents of chatbar didn't change.
Moved all relevant vars to the typing_indicator.dm
Added 'typing' var, as 'if(!(typing_indicator in overlays))' didn't work and overlays kept being added forever.
Fixed preference toggle feedback being backwards.
Fixed wrong verb called in hotkeys mode.
It's toggleable as client preference.
Displays dots(codersprite) near the mob when he starts typing a message.
Detects chatline me and say via checking contents.
Detects shortcut input me an say via hacky wrapper that's called now instead of direct say/me verbs.
