Remove C-based simulator for now

b_asic/__init__.py

 """B-ASIC - Better ASIC Toolbox.
 ASIC toolbox that simplifies circuit design and optimization.
 """
-# Extension module (C++).
-# NOTE: If this import gives an error,
-# make sure the C++ module has been compiled and installed properly.
-# See the included README.md for more information on how to build/install.
-from b_asic._b_asic import *
-
 # Python modules.
 from b_asic.core_operations import *
 from b_asic.graph_component import *