SNClient

Changes:

- drop privileges when running node exporter
- update node exporter to 1.7.0
- add node exporter to osx packages
- add check_load plugin
- improve docs and help pages
- add folder size support to check_files (#38)
- add basic promethes metrics
- check_eventlog: finish implementing
- fix reading empty config files (#58)
- fix packaging for debian <= 12

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