SNClient

Changes:

- add built-in check_http / check_tcp / check_dns
- add check_omd check
- msi windows installer:
  - do not change windows service during updates

Changes:

- support filter regex syntax: attr ~~ /value/
- return error if using unknown check arguments
- add (prometheus) node/windows exporter and custom exporters
- fix check_drivesize showing wrong disk on linux
- fix windows installer removing snclient.ini on update

Changes:

- windows: add firewall on program, not ports
- add on demand macros
- add prometheus exporter exporter listener
- add support for shared listeners