Mixing file rename with other changes should be avoided.
Using 'module_py_api' convention here
is in keeping with imbuf, idprop, blf & bmesh.
No reason for gpu to have a different convention.
Instead of crashing, an error message is displayed if a function of the gpu module is called without a GPU context.
Reviewers: brecht, campbellbarton, JacquesLucke, mont29
Subscribers: abdelmatinboulbayam, amir.shehata
Differential Revision: https://developer.blender.org/D4143