This now works and Kawari has achieved basic multiplayer! This is of course with
a hundred caveats:
* Previously spawned players are not backfilled
* There is no range or zone detection
* They are carbuncle clones of you, not the other character's data
But it actually WORKS!
Instead of standalone functions in the common module to perform game data tasks,
there is now a shared GameData struct that these functions moved to. This speeds
up a few things, and can take advantage of Physis' built-in index caching.
I know the current solution isn't ideal (each connection has to mutex lock to
access gamedata) but it's at least better than before.
Now the world isn't hardcoded to Gilgamesh, and is configurable. It's also now
the "Dev" server listed in the excel sheet which makes a more sensible default.
This is unfortunately lumped into one big commit, and is very hacky and WIP but
does indeed work! Since the Lobby and World server are two separate servers, it
uses it's own custom IPC packets (reusing the same packet structures as regular
game ones.)
The characters you create in the Lobby server are now saved in the World server,
but this is not yet reflected in the Lobby screen.
