Some more preparations and a start for Swift in Pecunia.

- Converted RemoteResourceManager to Swift.
- Added Swift extensions for ShortDate and MessageLog.
- Added DEBUG flag to Swift compiler flags so we can still use #if DEBUG #endif.
- Replaced CocoaLumberjack files by the framework.
- Renamed MOAssistant.assistant to MOAssistant.sharedAssistant to comply with general naming rules and make it accessible to Swift.
- Added empty def for __weak in the bridging header to avoid trouble with the Swift compiler wrt weak properties.
- Added smartcart entitlement for Pecinia.