Zabbix support (#1)

* when specified export status as json

* Example of json status output

* json status output noted in readme

* Support for zabbix discovery

* bool syntax fix

* Try to output zabbix discovery json

* port extracting syntax fix

* Port extracting fix

* Last port extraction fix

* Port split fix

* Port extract

* Uri extract

* port extract

* port neasi ?

* Port ?

* Comment fix

* Allow use of custom SQL credentials

* Discovery subcommand added

* Skip empty configurations

* Better check for empty config file line

* Fixed warning in case of inactive port

* Convert plaintext password to secureString first

* Decode SecureString for ConnectionString password

* Most of powershell language warnings solved

* Note about zabbix support

* If poweshell version  < 7, use fallback

* mserver health powershell compatibility + json

* health json output

* Low Lever Discovery & status check for zabbix

* Low Lever Discovery & status check for zabbix note

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Co-authored-by: Vítězslav Dvořák <vitezslav.dvorak@spojenet.cz>