Nwg Look Versions Save

• unnecessary label removed #11
• added support for color scheme #4
• added (missing) exporting ~/.icons/default/index.theme #9
• removed -n argument, 'Preferences' tab and ~/.config/nwg-look/config file added instead
• added exporting ~/.gtkrc-2.0 #7
• added exporting ~/.config/xsettingsd/xsettingsd.conf #6

Added support for org.gnome.desktop.interface.color-scheme / gtk-application-prefer-dark-theme (resolves #4).

• minor fixes #1
• logging fixed and shortened
• some comments added to the code

initial release