Fix default value for modManagerLog.occurred column (#16526)

### What does it do?
Adds a default value for the datetime column in the modx_manager_log
table that is compatible with strict modes, which may be enabled in some
environments.

Re-up of #15736 with migration
Re-up of #16520 to target 3.0.x

### Why is it needed?
Beginning with MySQL > 5.7.8 added strict modes
ERROR_FOR_DIVISION_BY_ZERO, NO_ZERO_DATE, NO_ZERO_IN_DATE. With these
strict modes enabled, a datetime default value cannot be NULL and must
be > '0000-00-00'.

### How to test
Install/update on MySQL 5.7.8

### Related issue(s)/PR(s)
Re-up of #15736
Re-up of #16520

---------

Co-authored-by: Mark Hamstra <hello@markhamstra.com>

core/model/schema/modx.mysql.schema.xml

@@ -646,7 +646,7 @@
 
     <object class="modManagerLog" table="manager_log" extends="xPDO\Om\xPDOSimpleObject">
         <field key="user" dbtype="int" precision="10" attributes="unsigned" phptype="integer" null="false" default="0" />
-        <field key="occurred" dbtype="datetime" phptype="datetime" null="true" default="NULL" />
+        <field key="occurred" dbtype="datetime" phptype="datetime" null="false" default="CURRENT_TIMESTAMP" />
         <field key="action" dbtype="varchar" precision="100" phptype="string" null="false" default="" />
         <field key="classKey" dbtype="varchar" precision="100" phptype="string" null="false" default="" />
         <field key="item" dbtype="varchar" precision="255" phptype="string" null="false" default="0" />

core/src/Revolution/mysql/modManagerLog.php

@@ -18,7 +18,7 @@ class modManagerLog extends \MODX\Revolution\modManagerLog
         'fields' => 
         array (
             'user' => 0,
-            'occurred' => NULL,
+            'occurred' => 'CURRENT_TIMESTAMP',
             'action' => '',
             'classKey' => '',
             'item' => '0',
@@ -38,8 +38,8 @@ class modManagerLog extends \MODX\Revolution\modManagerLog
             array (
                 'dbtype' => 'datetime',
                 'phptype' => 'datetime',
-                'null' => true,
-                'default' => NULL,
+                'null' => false,
+                'default' => 'CURRENT_TIMESTAMP',
             ),
             'action' => 
             array (

setup/includes/upgrades/common/3.0.5-db-changes.php

@@ -0,0 +1,12 @@
+<?php
+
+/**
+ * Database changes for 3.0.5
+ *
+ * @var modX $modx
+ * @package setup
+ */
+
+$manager = $modx->getManager();
+
+$manager->alterField(\MODX\Revolution\modManagerLog::class, 'occurred');

setup/includes/upgrades/mysql/3.0.5-pl.php

@@ -0,0 +1,11 @@
+<?php
+/**
+ * Specific upgrades for Revolution 3.0.5-pl
+ *
+ * @var modX $modx
+ * @package setup
+ * @subpackage upgrades
+ */
+
+/* run upgrades common to all db platforms */
+include dirname(__DIR__) . '/common/3.0.5-db-changes.php';