getQuickInviteLinkSteamID(link) {
		let match = link.match(/^https?:\/\/s\.team\/p\/([^/]+)\/([^/]+)/);
		if (!match) {
			return null;
		}

		return Helpers.parseFriendCode(match[1]);
	}
Get the SteamID to whom a quick-invite link belongs.
@param {string} link
@returns {SteamID|null} - null if the link isn't well-formed