Add a progress bar to the shortcut "Copying to RAMCard:" text startup screen

[ph0enix-c0der]

There should be a progress bar added to the shortcut "Copying to RAMCard:" text startup screen that occurs while copying a shortcut's parent folder to a RAMCard while booting / starting Apple II DeskTop after setting a shortcut to "Copy to RAMCard:" "at boot".

[inexorabletash]

This is a good idea. An actual progress bar might be difficult since the launcher (DESKTOP.SYSTEM) doesn't enumerate the files prior to copying them, like DeskTop itself does. The text-based interface (TUI) progress bar code is also currently only set up for a constant number of items known at compile time.

One idea I've had is to show a progress bar relative to the number of shortcuts (e.g. 24) and show the filenames below the progress bar. In incremental improvement would be to make the progress bar dynamic and make it relative to the number of "at boot" shortcuts.

I've marked this "Good First Bug" as this is all TUI code, so no knowledge of the GUI code is necessary and no funky bank switching knowledge is needed.