My bluetooth icon/applet disappeared from the menu bar/wingpanel in elementary OS. I've been running it for months and all of a sudden it wasn't there. Sound, wifi, battery, and power etc. applets are still present. Wifi works. Bluetooth doesn't work (even when I try to launch from System Settings. I've tried log out/in, reboot, killall wingpanel, no effect. Which bluetooth applet does eOs use?