feat(editor): every switch laid in the editor gets the key frogs, a box in the Switch panel sets or clears it as one undo step; the editor rebuilds the tracks crossing a changed or removed one; self-test commands frog, crossings, frogkey and geomhash; Polish translation

editor/editorTrack.hpp

@@ -49,6 +49,7 @@ class editor_track
 		material_handle material1{0};
 		material_handle material2{0};
 		material_handle material3{0};
+		bool frogs{false};
 		float texlength{4.f};
 		float texheight{0.6f};
 		float texwidth{0.9f};