Saylink and EVENT_PROXIMITY_SAY requests

[Sion]

There are three things I would love to see done with saylinks that would make them even more powerful:

- Having the option of making saylinks private - where the saylinks won't actually make the player say anything - the npc just reacts as if they said it.

- Getting saylinks to work with EVENT_PROXIMITY_SAY - as of right now, they don't seem to work with proximity say at all.

- Getting saylinks to work in popup windows - I'm not sure if this is already doable and I'm just doing it wrong, but I haven't been able to get saylinks to work in popup windows. They show up as clickable text but when clicked, nothing happens.

I also have a request for EVENT_PROXIMITY_SAY:

- Right now, a proximity say will only count if the player doesn't have a target. It should be counted as long as the player is in the proximity, regardless of target.