Player Index list implementation

Currently Netscape does not support multiple players, all players have the same ID 1. Need to implement a entity list which assigns the correct index to new players

No files or tests are named. Start by locating where new players are created and where player ID 1 is assigned, then trace the player entity representation. Done means the server can maintain multiple players and assign each new player the correct distinct index; add or update coverage for that behavior if the project has relevant tests.

Written by the indexing model from the issue text.