create sdl_win32 build, add platform builds to CI (#144)

* fixes for 64bit build
* create sdl_win32 target

.vscode/settings.json

@@ -337,7 +337,8 @@
     "iomanip": "cpp",
     "packed.h": "c",
     "endings.h": "c",
-    "team_play.h": "c"
+    "team_play.h": "c",
+    "stdlib.h": "c"
   },
   "asm-code-lens.donated": true,
   "editor.formatOnSave": true,