minivmac: finish cleaning up wrapper code and release it

[Rhys-T]

So you can do things like:¹

minivmac-ii.makeWrapper {
    name = "lemmings";
    displayName = "Lemmings";
    disks = [
        (minivmac.lib.disks.readOnly ./lemmings.dsk)
		(minivmac.lib.disks.formatBlank "800k" "Saved Games")
    ];
}

Then when you run lemmings (or select Lemmings from an XDG app menu, or open Lemmings.app on macOS) it will automatically set up a directory with disk1.dsk through diskN.dsk and run Mini vMac with it. Set up the disk with AutoQuit or AutQuit7, and you can pretend it's a native app.

Footnotes

1. I know, I know. You don't need a "Saved Games" disk because Lemmings uses passwords. It's an example. Just go with it. ↩