Verify that damage values match in a multi-game

[roncli]

Because the pre-retail-1.1 game files have different damage amounts than retail-1.1 and beyond (see Hyper fusion issue), it would be awesome if Retro would verify that the game files of a client match the game files of a host, to avoid issues that arise because someone unknowingly has the older files.

This could easily be done by ensuring that the values of Weapon_info[i].strength[j] match each other when connecting. Here's how to get those values:

for(int i = 0; i < MAX_WEAPON_TYPES; i++) {
	for (int j = 0; j < NDL; j++) {
		con_printf(CON_NORMAL, "Type: %d - Difficulty: %d - Value: %0.3f\n", i, j, f2fl(Weapon_info[i].strength[j]));
	}
}

The idea is that a client connecting to a host would send a packet containing all the data to the host, and if the data doesn't match the host's it doesn't allow the client to connect.