refactored some code into services, switched to Autofac for IoC
refactored settings view models to use Autofac
added graph service
refactored view models used by workspaces to use Autofac
changed "word" to "form" for sorting and searching
fixed various bugs

-cached comparison results were not loaded when project opened
-copying a word pair from global correspondences did not include variety names
-multiple word alignment was not updated properly when project opened
added global correspondences chart export