Handling entire Commodore (D64/D71/D81) disk image directories (using Per Olofsson's "diskimage.c" library)

Changes for 0.06 - 2023-08-28

• remove extraneous argument to "use_ok" ("D64:😁isk:😁ir::Entry" does not export anything, so passing arguments to its "import" methods is pointless; in the future it will be considered an error to pass arguments to an undefined "import" method) - fix submitted by haarg