Removed old Microsoft Visual Studio C++ files (in 'visualc').

Created a new "win32" folder with (most of the) things from 'visualc'
that are still being used ('resource.h', 'resources.rc' and 'tuxpaint.iss').

win32/resource.h

@@ -0,0 +1,17 @@
+//{{NO_DEPENDENCIES}}
+// Microsoft Developer Studio generated include file.
+// Used by resources.rc
+//
+#define IDI_ICON1                       101
+#define IDD_ABORTDLG                    104
+
+// Next default values for new objects
+// 
+#ifdef APSTUDIO_INVOKED
+#ifndef APSTUDIO_READONLY_SYMBOLS
+#define _APS_NEXT_RESOURCE_VALUE        102
+#define _APS_NEXT_COMMAND_VALUE         40001
+#define _APS_NEXT_CONTROL_VALUE         1000
+#define _APS_NEXT_SYMED_VALUE           101
+#endif
+#endif