Updated BZFlag to 2.4.20 which adds new API events and updated client menus.

Summarized Changelog:

• Reorganization of the menus to improve usability.
• Add bz_isWithinWorldBoundaries to API
• Use teleporter names in /saveworld .obj exports.
• Add bz_getSpawnPointWithin to API.
• Significantly improve platform-dependent header imports.
• Don't allow hunt to be used when not connected to a server.
• Improve vsync settings with SDL2.

The full changelog can he found here.

Tested 2.4.20 by connecting to a game server, changing settings, and loosing a match badly. Everything looked and functioned as expected.