* Add Hint viewer
- Add hints for arrows and lines
- Add hints for resizing elements
* Swap priority of multi mode and resize mode in Hint Viewer
* Remove dangling locales from public
* Add shortcut to hide hints
* Change hint texts and show resize hint ONLY during resizing
* Remove hints toggling
With the infinite scroll behavior, it's easy to scroll super far away from where the content is and have a hard time getting back. This PR adds a button to refocus on the center of the scene when no elements are visible anymore.
There are two problems with the current localization strategy:
- We download the translations on-demand, which means that it does a serial roundtrip for nothing.
- withTranslation helper actually renders the app 3 times on startup, instead of once (I haven't tried to debug it)
