remove browse mode and code that became dead as a result of its removal, because the new plan is to launch the program from the terminal (and terminal navigation is okay)

fcore/normal-mode.sml

@@ -349,26 +349,11 @@ struct
       getDrawMessage (model, initialMsg)
     end
 
-  fun enterBrowseMode model =
-    let
-      val model = AppWith.mode (model, AppType.BROWSE_MODE)
-      (* todo: should draw modal window as well *)
-      val fileMsg = LOAD_FILES (#openFilePath model)
-      val fileMsg = [FILE fileMsg]
-    in
-      (model, fileMsg)
-    end
-
   fun enterMoveMode model =
     let val model = AppWith.mode (model, AppType.MOVE_MODE)
     in (model, [])
     end
 
-  fun handleFileBrowserAndPathInNormalMode (model, fileBrowser, path) =
-    let val model = AppWith.fileBrowserAndPath (model, fileBrowser, path)
-    in (model, [])
-    end
-
   fun flipHorizontally (model: app_type) =
     let
       val {layerTree, arrowX, arrowY, ...} = model
@@ -409,7 +394,6 @@ struct
     | USE_LAYERS {tree, canvasWidth, canvasHeight} =>
         useLayers (model, tree, canvasWidth, canvasHeight)
     | SQUARES_LOAD_ERROR => CommonUpdate.squaresLoadError model
-    | KEY_CTRL_O => enterBrowseMode model
     | ARROW_UP => moveArrowUp model
     | ARROW_LEFT => moveArrowLeft model
     | ARROW_RIGHT => moveArrowRight model
@@ -417,6 +401,4 @@ struct
     | KEY_BACKSPACE => backspace model
     | KEY_ENTER => enterOrSpaceCoordinates model
     | KEY_SPACE => enterOrSpaceCoordinates model
-    | FILE_BROWSER_AND_PATH {fileBrowser, path} =>
-        handleFileBrowserAndPathInNormalMode (model, fileBrowser, path)
 end