Fixed some CD-ROM commands not stopping audio play when they should have (fixes data playing as audio, producing nasty artifacts, in some games), and increased the media history for all drive types from 4 to 10, also refactored cdrom_read_sector() and moved the last module-wide variables into the cdrom_t struct.

src/include/86box/cassette.h

@@ -153,7 +153,7 @@ void pc_cas_print_state(const pc_cassette_t *cas);
 void pc_cas_clock(pc_cassette_t *cas, unsigned long cnt);
 void pc_cas_advance(pc_cassette_t *cas);
 
-#define CASSETTE_IMAGE_HISTORY    4
+#define CASSETTE_IMAGE_HISTORY    10
 
 extern pc_cassette_t *cassette;