Player:SteamID64
Description
Returns the player's full 64-bit SteamID, also known as CommunityID. Information on how data is packed into this value can be found here.
See Player:AccountID for a function that returns only the Account ID part of the SteamID and Player:SteamID for the text version of the SteamID.
In a 
-multirun environment, this will return "0" for all "copies" of a player because they are not authenticated with Steam.
For bots, this will return 90071996842377216 (equivalent to STEAM_0:0:0) for the first bot to join.
For each additional bot, the number increases by 1. So the next bot will be 90071996842377217 (STEAM_0:1:0) then 90071996842377218 (STEAM_0:0:1) and so on.
Returns
1 string 
Player's 64-bit SteamID aka CommunityID.
The return value is a string, not a number, since Lua's numbers are unable to store the entire 64bit numbers without data loss.
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