Finished word list loading and fixed a number of smaller issues.
- Added ExSwift as submodule (contains many useful extensions for classes like arrays, dicts etc.) + added the code to the project (not possible as framework atm).

- Added swift header to pch so all parts of the app can now access swift classes.
- Fixed a number of warnings caused by that.

- Added own swift extensions for some of our AppKit extensions (written in Obj-C). Goal is to migrate the code fully over to swift.
- Moved natural string processing from obj-c to swift.

- Added ExSwift to credits file.
- Removed references to non-existing outlets from Preferences.xib.
- Removed obj-c WordList class and added WordMapping swift class instead.
- Renamed configurations in data model. Added WordMapping entity to SharedDataConfiguration.
- Implemented loading of the word list into the shared data.
- Moved private parts of MOAssistant from the header to the implmentation. Some simplifications in the code + support for the new shared data store.
- Added more header files from Objective-Zip to the bridging header (needed for word list loading).

- Updated PecuniaListView for the changed notification reference (a global var in obj-c, now a class func in swift (class vars are not supported yet)).

- Some work on the INAppStoreWindow 3rd party code to fix the warning for incompatible view added to the main window (not yet finished).