macOS .dmg meta-issue

[zmughal]

• Add codesigning. Without codesigning, the user has to manually open the bundle https://support.apple.com/guide/mac-help/open-a-mac-app-from-an-unidentified-developer-mh40616/mac.
• Allow running directly from the .dmg. This means that anything that needs to be written (e.g., the gdk-pixbuf loader cache) should be written to the user's $HOME directory and not into the bundle (which is read-only when run from a .dmg). A possible solution is to list this directory in the application configuration.
  • https://stackoverflow.com/questions/9495503/applications-data-folder-in-mac
  • https://metacpan.org/pod/File::HomeDir::Darwin
• Use PAR::Packer to set the name of the application in the menu bar (instead of just "perl").