Port all functions from ArrayFire 3.0

[pavanky]

Import from each header file into a unique python source file. Also add simple_XYZ.py in tests/ that run each of the functions to make sure they are running. These tests need not test for accuracy.

• algorithm
• arith
• array
• blas
• data
• defines (library.py)
• device
• features
• graphics
• image
• index
• lapack
• signal
• statistics
• util
• version (merge with util)
• vision

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C++ only headers that are not being ported

• exception.h (ported the necessary C function to util.py)
• complex.h
• dim4.hpp
• gfor (are there any necessary bits??)
• constants