Remove Monitoring->Triggers (Z4)

To deliver to Zabbix product:

• Monitoring?Triggers must be removed from Zabbix UI. In order to avoid functional regression the following features must be implemented:
• Monitoring?Problems will display trigger dependencies same or better way as it was implemented for Monitoring?Triggers
• Monitoring?Problems will be extended by a new entry in trigger context menu "TRIGGER?Description", which will display trigger description in an overlay window exactly same way as it is done currently in -
• Monitoring?Triggers?Description
  All existing links to Monitoring?Triggers must be replaced by links to Monitoring?Problems.
• An upgrade patch must be implemented in order to remove login URLs containing "tr_status.php".