[crossfire] Crossfire Forum Relaunch, new URL

[Rick Tanner]

After an extended period of testing, development, and updates, the 
Crossfire Forum is back online at a new URL, running the latest version 
on an upgraded operating system and improved hardware.

https://forum.cross-fire.org

User login information should remain unchanged for existing accounts.

If you encounter issues with password reset, please contact me (Leaf) on 
IRC or Discord for assistance.

(This was also posted at, 
https://forum.cross-fire.org/phpBB3/viewtopic.php?p=12242)