Core/Commands: Add new spy command (#1263)

Add a new spy command for game masters and administrators to receive all conversations of followed players.

How to use:

- Use command .spy follow <characterName> with a GM 
- Make that player whisper another player
- You (GM) should receive the message sent
- Use command .spy status. You should get a list with the test subject's name in it.
- Use command .spy unfollow <characterName>
- You should not receive any more messages sent or received by that player


* Core/Commands: Add new spy command
* Importing pending sql
* Fix missing comma in SQL
* Fix travis compile: comment unused parameter

data/sql/updates/db_world/2019_01_11_00.sql

@@ -0,0 +1,39 @@
+-- DB update 2019_01_10_00 -> 2019_01_11_00
+DROP PROCEDURE IF EXISTS `updateDb`;
+DELIMITER //
+CREATE PROCEDURE updateDb ()
+proc:BEGIN DECLARE OK VARCHAR(100) DEFAULT 'FALSE';
+SELECT COUNT(*) INTO @COLEXISTS
+FROM information_schema.COLUMNS
+WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'version_db_world' AND COLUMN_NAME = '2019_01_10_00';
+IF @COLEXISTS = 0 THEN LEAVE proc; END IF;
+START TRANSACTION;
+ALTER TABLE version_db_world CHANGE COLUMN 2019_01_10_00 2019_01_11_00 bit;
+SELECT sql_rev INTO OK FROM version_db_world WHERE sql_rev = '1547165890320901800'; IF OK <> 'FALSE' THEN LEAVE proc; END IF;
+--
+-- START UPDATING QUERIES
+--
+
+INSERT INTO `version_db_world` (`sql_rev`) VALUES ('1547165890320901800');
+
+DELETE FROM `trinity_string` WHERE `entry` BETWEEN 5062 AND 5071;
+INSERT INTO `trinity_string` (`entry`, `content_default`) VALUES
+(5062, 'You will now read %s conversations.'),
+(5063, 'Stopped spying %s.'),
+(5064, '%s is already being followed by: %s'),
+(5065, 'Following %s\'s group, you will now read each player\'s conversations.'),
+(5066, 'Stopped spying %s\'s group.'),
+(5067, 'You are not spying %s\'s group.'),
+(5068, 'Cleared all followed players.'),
+(5069, '[ v ]==== Current spy list ====[ v ]'),
+(5070, '[SPY] %s whispers %s: %s'),
+(5071, '[SPY] %s tells group: %s');
+
+--
+-- END UPDATING QUERIES
+--
+COMMIT;
+END //
+DELIMITER ;
+CALL updateDb();
+DROP PROCEDURE IF EXISTS `updateDb`;