Backend image rendering as plugin (#11966)

* rendering: headless chrome progress

* renderer: minor change

* grpc: version hell

* updated grpc libs

* wip: minor progess

* rendering: new image rendering plugin is starting to work

* feat: now phantomjs works as well and updated alerting to use new rendering service

* refactor: renamed renderer package and service to rendering to make renderer name less confusing (rendering is internal service that handles the renderer plugin now)

* rendering: now render key is passed and render auth is working in plugin mode

* removed unneeded lines from gitignore

* rendering: now plugin mode supports waiting for all panels to complete rendering

* fix: LastSeenAt fix for render calls, was not set which causes a lot of updates to Last Seen at during rendering, this should fix sqlite db locked issues in seen in previous releases

* change: changed render tz url parameter to use proper timezone name as chrome does not handle UTC offset TZ values

* fix: another update to tz param generation

* renderer: added http mode to renderer service, new ini setting [rendering] server_url

vendor/github.com/go-xorm/builder/builder_insert.go

@@ -15,7 +15,7 @@ func (b *Builder) insertWriteTo(w Writer) error {
 		return errors.New("no table indicated")
 	}
 	if len(b.inserts) <= 0 {
-		return errors.New("no column to be update")
+		return errors.New("no column to be insert")
 	}
 
 	if _, err := fmt.Fprintf(w, "INSERT INTO %s (", b.tableName); err != nil {
@@ -26,7 +26,9 @@ func (b *Builder) insertWriteTo(w Writer) error {
 	var bs []byte
 	var valBuffer = bytes.NewBuffer(bs)
 	var i = 0
-	for col, value := range b.inserts {
+
+	for _, col := range b.inserts.sortedKeys() {
+		value := b.inserts[col]
 		fmt.Fprint(w, col)
 		if e, ok := value.(expr); ok {
 			fmt.Fprint(valBuffer, e.sql)