Hopefully fixed combat this time

- Fixed a crash on startup when using web users and combat. Web users
are now loaded when the first client connects, so there may be a few
seconds where user permissions are not correct.
- Removed the NetworkMessages_Server.lua file and implemented a nicer
override instead.
- Combat no longer requires a config option. It should automatically
sort itself out.
Merge pull request #23 from Person8880/develop

Hopefully fixed combat this time