Themes!

There is now a working theme engine for Gltn. Commands must be issued
via console, but you can install, uninstall, and select whichever theme
you want active.
-Created Blackout theme, a softer dark theme to demonstrate system
-Made Gltn more modular in order to support the variety of theming
capabilities
-New icons for dictionaries
-General bug and ux fixes
-No longer requiring a manual save to save dictionary order