Updated addressbook structure

- Created own project for AddressBook
- Moved EntryObjects to own project
- Tidied files
- Minor files removed
(Tidied project)
Alpha version of AddressBookEditor done

Missing:
- Editors for "Phone" and "Loop"
- Some cleanup and refactoring
- An own ISettingsView for the Editor
Fixed error in GetValue<T>()
Added "receipt type" to Mail-editor
Add "IsEnabled"-attribute when saving data items
Added missing default editors

- Loop, Phone-Number editors added
- Updated Mailaddress-editor
- minor refactoring
Added custom style to enabled/disabled-boxes

Makes intention more obvious
Fixed exception when first/last name were null

Added substitution to "(Unbenannt)" for them
Corrected spelling
Refactoring

- Addressbook-Editor is now own window (better usability)
- Updated user experience
- Removed obsolete interfaces
Added icon to AddressBook-Window
Added Growl to CustomData