Adding mightymac

This adds all the code needed to get mightmac setup, at least to start
with. A couple of other things were changed to account for this being
the first Apple Silicon Mac I have used.

Additionally, I have restricted VLC to only select Macs now due to
using a custom build of it on my work computer.

modules/hosts/darwin/AirPuppet/default.nix

@@ -7,6 +7,7 @@
       "backblaze"
       "calibre"
       "steam"
+      "vlc"
     ];
     masApps = {
       "HomeCam" = 1292995895;