Zabbix

A......... [ZBXNEXT-8758,ZBXNEXT-8938] added ability to add/remove proxies to/from groups:
 - added support for new properties "proxy_groupid" and "state";
 - added support for more fields in proxy.get "filter" and "search";
 - added support for new proxy.get parameters "proxy_groupids", "selectProxyGroup";
 - added support of "count" for "selectHosts";
 - made proxy.get refactoring and restructuring of related methods