Condense Database Migrations (#17103)

* Condense Database Migrations

Condenses the Database Migrations into a new initial schema.
Also adds some instructions to the Database Readme for existing setups.

* Update readme/delete changed migrations since pr creation

* Reworks a bit how the previous migrations are handled and updates the instructions accordingly

* Expand the readme with baseline/migrate

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Co-authored-by: Werner <Arrow768@users.noreply.github.com>

SQL/migrate-2017/V003__Ipintel.sql

@@ -0,0 +1,14 @@
+--
+-- Adds the IP intel database table.
+--
+
+CREATE TABLE `ss13_ipintel` (
+  `ip` varbinary(16) NOT NULL,
+  `date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  `intel` double NOT NULL DEFAULT '0',
+  PRIMARY KEY (`ip`),
+  KEY `idx_ipintel` (`ip`,`intel`,`date`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1;
+
+ALTER TABLE `ss13_player`
+  ADD `account_join_date` DATE NULL DEFAULT NULL AFTER `whitelist_status`;