Added per-device configuration.

Reworked configuration parser a bit.
Added configuration for S3 ViRGE and 8-bit Sound Blasters.
IRQ 2 routed to IRQ 9 on AT machines.

src/config.h

@@ -7,3 +7,8 @@ void set_config_string(char *head, char *name, char *val);
 char *get_filename(char *s);
 void append_filename(char *dest, char *s1, char *s2, int size);
 void put_backslash(char *s);
+
+void config_load();
+void config_save();
+void config_dump();
+void config_free();