Game server/clan system: started implementing clan accessors to help readability.
Game server/clan system: implemented a mockup of CKnightsManager::KnightsAllianceCreate() (looks like we don't need to bother responding with an error code anyway). Refs #18.
Game server/clan system: Mocked up CKnightsManager::KnightsAllianceInsert().
Game server/clan system: allowed for the KNIGHTS_WAR_ANSWER/KNIGHTS_WAR_SURRENDER opcodes.
Game server/clan system: implemented the packet to display all clans in an alliance. Refs #18.