removeFriend(steamID) {
		if (typeof steamID === 'string') {
			steamID = new SteamID(steamID);
		}

		this._send(EMsg.ClientRemoveFriend, {friendid: steamID.getSteamID64()});
	}
Remove a friend from your friends list (or decline an invitiation)
@param {(SteamID|string)} steamID - Either a SteamID object of the user to remove, or a string which can parse into one.