dev tools, tweaks and fix for #123

- updated the GUI so it's more intelligent and figures out if it needs
to modify the graphics pack files without an arbitrary setting. since we
can't trust the human, no we certainly cannot.

- added a new development tab to the ribbon (only available when the
debugger is attached) to run tests and export the settings)
Merge pull request #124 from splintermind/gold

Settings GUI update - dev tools, tweaks and fix for #123