begin merging files which were previously in temp-squares directory into main

message-types/input-msg.sml

@@ -22,8 +22,9 @@ struct
   | ARROW_DOWN
   | KEY_ENTER
   | KEY_SPACE
-  | USE_TRIANGLES of AppType.triangle list
-  | TRIANGLES_LOAD_ERROR
+  | USE_SQUARES of
+      {squares: int vector vector, canvasWidth: int, canvasHeight: int}
+  | SQUARES_LOAD_ERROR
   | FILE_BROWSER_AND_PATH of
       {fileBrowser: AppType.file_browser_item vector, path: string}
 end