Add notification.addCaption

[thegrb93]

Fixes: #1898

[thegrb93]

Need to make sure spamming it doesn't crash the game

[adamnejm]

Need to make sure spamming it doesn't crash the game

Everything is fine on my end, can lag a little bit, but that's fine with the permissions.
Special characters do not cause any issues either.

The problem is with special captions, take this for example:

for i = 1, 60 do
    notification.addCaption("<delay:"..i..">Ughhh", 1)
end

The captions will continuously show up, even if the chip is removed. This could be abused.

The <len> arg can be fucked around with too.

[adamnejm]

Although take "abuse" lightly here, at most I think it would force the user to reconnect to the server to make the captions disappear or set closedcaptions to 0.

[adamnejm]

Would be nice if there was a command to clear the closed captions, but I tested all the cc_* commands and none of them do that.

[thegrb93]

I didn't realize there were embedded commands. Probably don't want this then, and it's not that hard to render your own.