Convert entire OpenRAM to use python3. Works with Python 3.6.

Major changes:
Remove mpmath library and use numpy instead.
Convert bytes to new bytearrays.
Fix class name check for duplicate gds instances.
Add explicit integer conversion from floats.
Fix importlib reload from importlib library
Fix new key/index syntax issues.
Fix filter and map conversion to lists.
Fix deprecation warnings.
Fix Circuits vs Netlist in Magic LVS results.
Fix file closing warnings.

compiler/tests/10_write_driver_array_test.py

@@ -1,6 +1,6 @@
-#!/usr/bin/env python2.7
+#!/usr/bin/env python3
 """
-Run a regresion test on a write driver array
+Run a regression test on a write driver array
 """
 
 import unittest