Make fixes, improvements, and chibicc python bindings

- python now mixes audio 10x faster
- python octal notation is restored
- chibicc now builds code 3x faster
- chibicc now has help documentation
- chibicc can now generate basic python bindings
- linenoise now supports some paredit-like features

See #141

third_party/python/Lib/test/test_scratch.py

@@ -8,10 +8,10 @@ exit1 = cosmo.exit1
 
 class BooTest(unittest.TestCase):
     def test_boo(self):
-        pass
         # cosmo.ftrace()
-        # chr(33)
+        # eval('0')
         # exit1()
+        pass
 
 if __name__ == '__main__':
     unittest.main()