Added Ability to set Webhooks triggered by Trudesk

[clackner-gpa]

This PR adds the ability to trigger webhooks to tie into various applications such as Slack, Mattermost etc when a Ticket changes. To configure a webhook the src/settings/json/webhook-config.json can be edited. Fields in each hook are:

• action - either created or updated. created fires if a new model is added, updated fires when an existing model is updated
• model - specifies the model the webhook is attached to options are: messages, departments,groups,notices,notifications,tags,tickets,ticketpriorities,users, ticketStatuses
• payload - the payload send to the endpoint. Strings can include substitutions of the form {{sub}} where sub is a JS expression with thedatavariable available and corresponding to the model. (e.g. forticketsyou can use{{ticket.uid}}`
• endpoint - The URL of the endpoint that gets called.

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This PR was closed because it has been stalled for 10 days with no activity.