0.13.0rc1

Added

• Documentation.
• Support NumPy functions via dpNP: random, linalg, transcendental, array ops, array creation.

Changed

• Start using black code style formatter.
• Start using Apache 2.0 license.
• Updated to Numba 0.52, dpCtl 0.6 and dpNP 0.5.1.
• Start using pytest for running tests.