copy mpris implementation from infinitime library to itd, where it really belongs

moved dbus.go to an internal utils package
added context function parameter to initMusicCtrl and updated main.go to pass it
updated calls.go, maps.go, music.go, and notifs.go to use utils package for getting a dus connection

internal/utils/dbus.go

@@ -0,0 +1,41 @@
+package utils
+
+import (
+	"context"
+
+	"github.com/godbus/dbus/v5"
+)
+
+func NewSystemBusConn(ctx context.Context) (*dbus.Conn, error) {
+	// Connect to dbus session bus
+	conn, err := dbus.SystemBusPrivate(dbus.WithContext(ctx))
+	if err != nil {
+		return nil, err
+	}
+	err = conn.Auth(nil)
+	if err != nil {
+		return nil, err
+	}
+	err = conn.Hello()
+	if err != nil {
+		return nil, err
+	}
+	return conn, nil
+}
+
+func NewSessionBusConn(ctx context.Context) (*dbus.Conn, error) {
+	// Connect to dbus session bus
+	conn, err := dbus.SessionBusPrivate(dbus.WithContext(ctx))
+	if err != nil {
+		return nil, err
+	}
+	err = conn.Auth(nil)
+	if err != nil {
+		return nil, err
+	}
+	err = conn.Hello()
+	if err != nil {
+		return nil, err
+	}
+	return conn, nil
+}