Prior to this commit, when you double-click a .zip file to open it, it
gets opened in Text-Editor as there is no other file association.
Now, when FileManager is invoked with a .zip file as the first argument,
a temporary directory will be created and the .zip will be extracted
into it. Once the FileManager window is closed, Core::TempFile will
delete the temporary directory.
This adds something like what we see in other operating systems' file
explorers, except for the fact that most other operating systems will
treat the .zip file as its own independent read-only filesystem. It
would be nice to do that in the future, but I feel like this is
sufficient for now.
With everything now using GUI::FileIconProvider and therefore loading
icons embedded in the executable files, this information is now longer
being used.
We might have to think about this again if we want to allow .af files
with custom commands (e.g. shell scripts). Maybe those could get away
with just an "Icon" entry under "[App]", but currently there's only
"Executable" anyway.
The new system directory /res/apps now contains ".af" files describing
applications (name, category, executable path, and icon.)
These are used to populate the system menu with application shortcuts.
This will replace the Launcher app. :^)
