for D1265 (and future), it would be useful to have a way to test easily the AI chats messages.
This patch adds a function which displays all AI messages, with a new variation every about 15s.
The function itself is not used in game, so can be commited if it solves Gallaceo needs.
The way to call it (i.e. call the function from headquarters::update) will still have to be done manually when needed.
As the numbers of messages is important, they are separated in 2 parts, given by the second argument of the function.
PS the "about 15s" delay could be added as a third argument of the function if that's too short.