Update light-locker-settings for 1.4.0

  • Add option in UI to enable/disable late-locking
    • Idea: instead of an on/off switch, which doesn't explain what “late locking” is and what happens if the switch is set to “off”, we could use a combobox with a label in front of it. Something along the lines of “Switch to lockscreen [when screen blanks|after the screen blanks]”. Or is this too cumbersome?
  • Add GtkSwitch for “lock on suspend”