Improve documentation of GameServer

[speedyman08]

• [ ] Documenting Refresh's codebase will be vital in getting more contributions.
• [ ] Some good places to start would be: how assets are stored on disk, the database schema, system users, authentication system, APIV3 classes, etc.
• [ ] Code/syntax styles should be clarified somewhere.

[speedyman08]

Stale - closing

[Beyley]

re-opening, we are still interested in this