BIG rewrite stream info

pkg/stdin/backchannel.go

@@ -49,10 +49,12 @@ func (c *Client) Stop() (err error) {
 }
 
 func (c *Client) MarshalJSON() ([]byte, error) {
-	info := &core.Info{
-		Type:   "Exec active consumer",
-		Medias: c.medias,
-		Send:   c.send,
+	info := &core.Connection{
+		ID:         core.ID(c),
+		FormatName: "exec",
+		Protocol:   "pipe",
+		Medias:     c.medias,
+		Send:       c.send,
 	}
 	if c.sender != nil {
 		info.Senders = []*core.Sender{c.sender}

pkg/stdin/client.go

@@ -6,6 +6,7 @@ import (
 	"github.com/AlexxIT/go2rtc/pkg/core"
 )
 
+// Deprecated: should be rewritten to core.Connection
 type Client struct {
 	cmd *exec.Cmd