wip: different heights for jump arrows

Note that this is very incomplete, for two different reasons:
- it's O(n^2) or potentially worse
- it makes the GC work hard (it invokes `new` in
  `LCanvas.DragLayout.layout()`)

For the second reason this does not clearly fit the criteria of
CONTRIBUTING.md, but I have yet to figure out ways to work around this
(or make the algorithm more efficient).

core/assets/bundles/bundle.properties

@@ -1225,6 +1225,7 @@ setting.bridgeopacity.name = Bridge Opacity
 setting.playerchat.name = Display Player Bubble Chat
 setting.showweather.name = Show Weather Graphics
 setting.hidedisplays.name = Hide Logic Displays
+setting.dynamicjumpheights.name = Dynamic Jump Heights
 setting.macnotch.name = Adapt interface to display notch
 setting.macnotch.description = Restart required to apply changes
 steam.friendsonly = Friends Only