Fixed blue spacers - at last!

TO DO:
Make code fully anonymous

Change activation key to Alt+ RightClick for mouse, to avoid other used combinations,

added ESC as an alternative to clear selection

Version 0.7.0.0 is an alpha version! Use at your own risk!

Known issues:
may not hide sleepTimer (who writes this stuff?) - will be fixed in next version of that add-on.
Entry to preferences does not show display status of elements (all show as checked); exit from preferences panel does not update display status of elements to all showing!.

TO DO:
Enable drag and drop with mouse
Add 'Reset' button to preferences (placeholder shows but does nothing)

Option to hide toolbar/controlpane completely?