Structured logging (#8673)

* Implementing structured logging

* Changes to en.json to allow refactor to run.

* Fixing global logger

* Structured logger initalization.

* Add caller.

* Do some log redirection.

* Auto refactor

* Cleaning up l4g reference and removing dependancy.

* Removing junk.

* Copyright headers.

* Fixing tests

* Revert "Changes to en.json to allow refactor to run."

This reverts commit fd8249e99bcad0231e6ea65cd77c32aae9a54026.

* Fixing some auto refactor strangeness and typo.

* Making keys more human readable.

api4/webhook.go

@@ -4,16 +4,15 @@
 package api4
 
 import (
+	"fmt"
 	"io"
 	"net/http"
 	"strings"
 
-	l4g "github.com/alecthomas/log4go"
-
 	"github.com/gorilla/mux"
 	"github.com/gorilla/schema"
+	"github.com/mattermost/mattermost-server/mlog"
 	"github.com/mattermost/mattermost-server/model"
-	"github.com/mattermost/mattermost-server/utils"
 )
 
 func (api *API) InitWebhook() {
@@ -492,7 +491,7 @@ func incomingWebhook(c *Context, w http.ResponseWriter, r *http.Request) {
 	}
 
 	if c.App.Config().LogSettings.EnableWebhookDebugging {
-		l4g.Debug(utils.T("api.webhook.incoming.debug"), incomingWebhookPayload.ToJson())
+		mlog.Debug(fmt.Sprint("Incoming webhook received. Content=", incomingWebhookPayload.ToJson()))
 	}
 
 	err = c.App.HandleIncomingWebhook(id, incomingWebhookPayload)