Added additional properties to getListPlayers and getSquads methods

[lbzepoqo]

Changes were suggested here.

This introduces several updates to the getListPlayers and getSquads methods in the rcon.js file, improving the amount of information returned by these methods.

For the getListPlayers method:

• Added a check to return the players array immediately if the response is empty or not defined. This prevents potential errors when trying to process an undefined or empty response.
• Updated the regex used to parse the response, allowing it to capture additional information about whether the player is a leader and their role.
• Added isLeader and role properties to the returned player object. The isLeader property is a boolean indicating whether the player is a squad leader, and the role property represents the role of the player.

For the getSquads method:

• Added a check to return the squads array immediately if the responseSquad is empty or not defined. This prevents potential errors when trying to process an undefined or empty response.
• Updated the regex used to parse the response, allowing it to capture additional information about the squad creator's name and Steam ID.
• Added creatorName and creatorSteamID properties to the returned squad object. These properties represent the name and Steam ID of the squad creator.