ver 3.17.90:

This version of the library adds Obex support to the settings
widget. When the settings panel will be opened, other devices
will be able to send files to the computer.

- Remove outdated end-user documentation

Settings:
- Better empty and disabled state views
- Handle service authorisation requests for HID devices (mice, joypads)
- Fix phone icon if extra icons aren't installed
- Add default PIN for Logitech Ultrathin Touch mouse and
  Microsoft Sculpt Comfort mice

Send-to:
- Show better error message when sending a file fails
- Disallow sending files to iDevices, they don't support Obex