Cango2D now merged with Cango

The Cango2D branch of the Cango graphics library has now been merged with the main branch.

Cango version 10 and later now has all the features of Cango2D such as Groups with inherited transforms now built in to Cango.

The final version of Cango2D source code was Cango2D-9v01.js should it be needed for maintenance of existing apps.