Generic way to rotate and flip shapes

It would be nice to provide an option to rotate a given shape or flip it.

Right now this could be accomplished using the transformer, but we had to disabled it since the rotate functionallity was buggy (not stable in our shapes).

So we need here first some brainstorming, my two cents:

• We could add an option in the context menu.
• We could add them on the properties panel (like the z-index thingie)

Another challenge we have to find a way that makes this generic (no need to be implemented on every shape, maybe let's start only with the basic shapes (the rest are not that important, and have an additional challenge resizing limitations and inline edition).

Maybe we could add a generic control that just adds a wrapper and applies a rotate transform on the shape?

Comienza revisando el transformer existente y cómo se gestionan las formas básicas. Compara el menú contextual y el panel de propiedades como posibles puntos de entrada y, a continuación, determina cómo un wrapper genérico podría admitir la rotación y el volteo sin implementaciones específicas para cada forma. Se considera terminado cuando el enfoque para las formas básicas seleccionadas esté acordado y sea estable.