(MESS) apfimag: added software list for cassettes (they require you
to mount the BASIC cart to be loaded, of course). [Fabio Priuli]

out of whatsnew: I also set the default tape state to CASSETTE_STOP, because the APF Imagination requires
you to immediately press Return after the CLOAD + Press Play sequence. With current CASSETTE_PLAY default,
the tape was starting immediately after the first Return press (the one for CLOAD) and I often had the second Return
input being ignored by the system, with the result that the tape was not loaded correctly... Having to press play separately
seems to give the system enough time to recover from the first Return and being ready to accept a second one ;)