Zabbix

..F....... [ZBXNEXT-581] split the views for items and discovery rule configuration forms

The code in this commit was mostly copy-pasted with minimal changes. But I have removed the itemTypeInterface() js function and changed the organizeInterfaces() function to request use translations from the  server side

The files have been separated in the following way:
configuration.item.edit.php - contains the item / item prototype configuration form
 configuration.host.discovery.edit.js - contains the LLD rule configuration form
 
 items.js - contains the JS code common for item, prototype, LLD configuration forms and the item mass update form
 common.item.edit.js - contains the JS common for item and LLD rule configuration forms
 configuration.item.edit.js - contains the JS for item and item prototype configuration forms;
 configuration.item.massupdate.js - contains the JS for the item massupdate form