add selection cut button and binding

README.md

@@ -11,20 +11,20 @@ logic mostly like https://git.crispypin.cc/CrispyPin/marble
 - comments
   - editing
   - add to all intro levels
+- UI layout engine
+  - global scale setting
 - highlight regions with background colours
 - accessibility
-  - ui scaling
   - background colour setting
   - hotkeys for everything (no mouse needed to play)
-  - font selection (probably a lot of work)
 - more levels
 - footprint and bounding box stats (instead of area)
 - scroll output bytes
-- cut selections, copy to system clipboard
 - timestamps in solutions and blueprints
 - lock tile types for early levels to make it less overwhelming
 - display tool variant more clearly (it's not obvious there are more states)
 - better text rendering
+  - font selection (probably a lot of work)
 ### online stuff
 - store scores in server
 - validate solutions in server (with limits)