Merge Airyx changes

[mszoek]

• Rename filer-qt to Filer
• Read startup args from Info.plist
• Add Info.plist and package as true .app bundle
• Read icon file name from Info.plist when showing bundles
• Read CFBundleDisplayName or CFBundleName from Info.plist when showing bundles
• Look for *.desktop and extract Name= string when showing AppDirs
• Open stuff with LaunchServices.framework
• Register discovered applications (.app) with LaunchServices