Extend rotation support to Shapes

[simoarpe]

Similarly to #79, it would be great to have the rotation method also for the Shapes.

[blacktm]

Great idea! Might you be interested in implementing it? 🙂

[Souravgoswami]

Yes, @simoarpe, This will be very helpful.

But now, I am happy with rotating image. Say I want to rotate a Square, at this point I will create an image of a square, and simply rotate it. Good and cheap solution.

Adding rotation will help a lot though...