Packages source list now lists the pkginfos directory too
Minor UI changes in the left side folder list
Created MACoreDataManager singleton class to serve as a helper
Fixed a bug where the base pkginfos directory would appear multiple times in the source list
Moved MunkiRepositoryManager to Singletons folder
Refactored code to MACoreDataManager
Started working on import item validation
Importing now checks for NSURLIsRegularFileKey before running makepkginfo
Running makepkginfo now checks the stderr for output
Added NSLocalizedRecoverySuggestionErrorKey for import errors
Added support for receiving pkginfo dictionaries from SUS Inspector
Initial support for drag and drop in packages list
Added final else
Removing a package now also removes all references to it if appropriate

If there are no more pkginfos with the same name, MunkiAdmin will now also remove any references to a pkginfo.
This includes "name" and "name-version" style references from the following:
- managed_installs item in a manifest
- managed_uninstalls item in a manifest
- managed_updates item in a manifest
- optional_installs item in a manifest
- requires item in a package
- update_for item in a package
Use package icon for dragImage
Improvements for the drag image
Fixed a bug where catalogs wouldn't appear for newly created pkginfo after receiving it from SUS Inspector