Support for importing "app" bundles.

[ismailcarlik]

This pull request introduces functionality for handling .app application bundles in addition to .ipa and .tipa files. The changes include updates to the DownloadManager, a new handler class for .app bundles, and modifications to the file import process in the LibraryView.

New functionality for .app bundles:

• DownloadManager enhancements:

  • Added a new startBundle method to initiate downloads specifically for .app bundles.
  • Introduced a handleAppBundle method to process .app bundles, including removing completed downloads from the list.

• New AppBundleHandler class:

  • Created AppBundleHandler to manage .app bundles, including copying files, adding metadata to the database, and cleaning up temporary files.

Refactoring and compatibility updates:

• Renamed AppFileHandler to IpaFileHandler:

  • Updated the class name and references to better reflect its purpose of handling .ipa files. [1] [2]

• File import process in LibraryView:

  • Extended the file importer to support .app bundles by adding .applicationBundle to the allowed content types and implementing logic to handle .app files.