Fixed CGA, Hercules, and MDA for the second time, per suggestion and code from basic2004;

Added IBM PS/2 Model 30 emulation per mainline PCem patch from dns2kv2;
Commented out the Chips & Technologies VGA 451 as it needs further work;
Added the ability to disable XTIDE;
Prepared the icon that will be used for stable builds.

src/resources.h

@@ -254,6 +254,7 @@
 #define IDC_CHECKBUSLOGIC 1017
 #define IDC_STATIC 1020
 #define IDC_CHECKSYNC 1024
+#define IDC_CHECKXTIDE 1025
 #define IDC_EDIT1  1030
 #define IDC_EDIT2  1031
 #define IDC_EDIT3  1032