Werk #6639: slack: New notification plugin for slack

It is now possible to for Check_MK to send notifications about state changes of hosts and services into a Slack channel.

Slack needs to be first configured to recieve messages from Check_MK. This can be done by setting up a Webhook here, where you specify which channel will recieve the notifications. In Check_MK, under "WATO - Notifications", create a new notification rule. And select under Notification Method Slack. Copy the URL that Slack gives you after completing the configuration into the Slack Webhook-URL field. Optionally if you want sent messages to include hyperlinks to Check_MK, enable the field URL prefix for links to Check_MK.

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