Tray application for Linux

Change-Id: I55862204ef71f69bc88c79fe2259f7cb8365699a
Autoconfiguration for Linux

Change-Id: I6874628f29de327e5ece7ffddf3433cbc88de968
Persistent settings + autostart + security tab

Change-Id: Iec35f732268caa99ff541e6d5d6478049ec41d50
Making use of preferences

Preferences now saved and used in the application logic (autoupdate is
not yet working though)

Change-Id: I8b3540f8a49c6a151d5cc54d9a49005e0a3c98d7