chore: remove helpdesk/ticket system (migrating to MokoSuiteCRM #67)

- Removed ticket views, models, controllers (ticket, tickets, ticketsettings)
- Removed plg_task_mokosuiteclient_tickets plugin and source
- Removed from package manifest, enablePlugin, protectExtensions
- Removed Helpdesk entry from sidebar menu
- Ticket tables kept in SQL for migration compatibility
- See MokoSuiteClient#233, MokoSuiteCRM#67

source/script.php

@@ -92,7 +92,6 @@ class Pkg_MokosuiteclientInstallerScript
 		$this->enablePlugin('webservices', 'mokosuiteclient');
 		$this->enablePlugin('task', 'mokosuiteclientdemo');
 		$this->enablePlugin('task', 'mokosuiteclientsync');
-		$this->enablePlugin('task', 'mokosuiteclient_tickets');
 
 		// Migrate params from core plugin to feature plugins (one-time)
 		$this->migrateFeatureParams();
@@ -691,7 +690,7 @@ class Pkg_MokosuiteclientInstallerScript
 			// Plugins that should exist on disk
 			$expected = [
 				'system' => ['mokosuiteclient_offline', 'mokosuiteclient_firewall', 'mokosuiteclient_tenant', 'mokosuiteclient_devtools', 'mokosuiteclient_dbip'],
-				'task'   => ['mokosuiteclient_tickets'],
+				'task'   => [],
 			];
 
 			foreach ($expected as $group => $elements)
@@ -754,7 +753,6 @@ class Pkg_MokosuiteclientInstallerScript
 				$db->quote('mod_mokosuiteclient_cpanel'),
 				$db->quote('mokosuiteclientdemo'),
 				$db->quote('mokosuiteclientsync'),
-				$db->quote('mokosuiteclient_tickets'),
 				$db->quote('mokoonyx'),
 			];