Add new fmd commands

I'd love to see some new commands, like

• fmd ring-3 (ring only for 3 seconds)
• fmd gps-on (activate GPS)
• fmd gps-off (deactivate GPS)
• fmd sound-on (activate sound)
• fmd sound-off (deactivate sound/activate silence-mode)
• fmd camera-front (picture send to server where it can be viewed for 7 days)
• fmd camera-back (picture send to server where it can be viewed for 7 days)
• fmd record-sound (sound file send to server where it can be listened for 7 days)
• fmd message hello please call 0123 because i lost my phone (show message on the phone as a popup message)

Keep up the great work! This app deserves much more attention

Edit: Some of them were already implemented