Enable images in menus by default.
Automatically autostart pcmanfm. Also, added the option to launch an application and wait until it exits.

It can be also be achieved during autostart by setting X-Vera-Launch-Sync at true.
Set DMZ-White as the default cursor theme.
dbus: added "ninja-shortcut" capabilities (--> the CTRL+ALT+SPACE shortcut found in Semplice 2.0+).

It is fully configurable via settings.

Added settings:
last-exit-action (enum)
lock-last-exit-action
ninja-shortcut

Added methods in the DBusService class:
store_exit_action() (private)
NinjaShortcut() (published)
Lock() (published)