Video features and fixes:

Added the Mach8 and Mach32 ISA/VLB/PCI cards (initial implementation and MCA coming soon for the Mach32) and their corresponding EEPROM's.
Added INMOS XGA ISA card and updated the SVGA core to reflect its mapping as well as the Mach8/32 mapping when in 8514 monitor mode.
Mark the XGA button as already checked and locked when a standalone XGA BIOS card is present like the INMOS one. (QT only)
Same concept as above, but applies to the Mach8 and 32 for the 8514 option as well. (QT only)

src/include/86box/vid_svga.h

@@ -31,8 +31,9 @@
 #    define FLAG_NOSKEW       16
 #    define FLAG_ADDR_BY16    32
 #    define FLAG_RAMDAC_SHIFT 64
-#    define FLAG_128K_MASK    128
-
+#    define FLAG_ATI      	  128
+#    define FLAG_S3_911_16BIT 256
+#    define FLAG_512K_MASK    512
 struct monitor_t;
 
 typedef struct {