Split DB Updates into seperate files, with the cutoff being 2.0.0

admin/database_updates/2.3.8.php

@@ -0,0 +1,24 @@
+<?php
+
+/*
+ * ITFlow - Database update to version 2.3.8 (from 2.3.7)
+ * Included by admin/database_updates.php - do not access directly
+ */
+
+defined('FROM_DB_UPDATER') || die("Direct file access is not allowed");
+
+    mysqli_query($mysqli, "
+        CREATE TABLE `asset_tags` (
+            `asset_tag_asset_id` INT(11) NOT NULL,
+            `asset_tag_tag_id` INT(11) NOT NULL,
+            PRIMARY KEY (`asset_tag_asset_id`, `asset_tag_tag_id`),
+            CONSTRAINT `fk_asset`
+                FOREIGN KEY (`asset_tag_asset_id`)
+                REFERENCES `assets`(`asset_id`)
+                ON DELETE CASCADE,
+            CONSTRAINT `fk_tag`
+                FOREIGN KEY (`asset_tag_tag_id`)
+                REFERENCES `tags`(`tag_id`)
+                ON DELETE CASCADE
+        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+    ");