Offline Protection is Exploitable

[Xantheose]

An online vassal should remove the protection as if it were an empire's avatar. This would balance a little the big/newbies empires gap.

Despite this, a friend alt empire is still possible to make the main empire protected everytime. Then, a way (probably not the better one) to prevent an empire from being always disconnected is to allow a offline protection when the last avatar disconnect with a maximum of 24h, and only if this empire was out of this protection at least one hour.

Then, it would allow regular empire to be protected as usual, but exploit-users will have to connect at least one hour every day to keep their protection.