Use consistent variable names

[stathismor]

We need to have some consistency on how we call things across server/client. Things like name/username, player/user, etc.

[dbertella]

what do you propose?

[dbertella]

Is this still a thing?

[stathismor]

Yeah, definitely. Some inconsistencies I am aware of:
username/name
user/player
gameIO/socket
cardKey is probably a cardId
Some files are lowercase (games, rooms, etc) while we have Socket Server etc

I generally think at some point, when we're almost done, we can review all these, and even names etc, and rename.