nwg-panel 0.9.10

• Controls: ensure that last refresh is finished before starting the next one #239 by @moetayuko, hopefully closes #225;
• Bluetooth and Network interface components removed from Controls, as no longer necessary (since we have the Tray module) #238 by @moetayuko;
• minor code cleanup #238 by @moetayuko;
• glyph reported to be missing from nwg-processes replaced with the "<" character.