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/Python/getargs.c

@@ -968,7 +968,7 @@ convertsimple(PyObject *arg, const char **p_format, va_list *p_va, int flags,
                 *p = PyUnicode_AsUnicodeAndSize(arg, &len);
                 if (*p == NULL)
                     RETURN_ERR_OCCURRED;
-                if (Py_UNICODE_strlen(*p) != (size_t)len) {
+                if (wcslen(*p) != (size_t)len) {
                     PyErr_SetString(PyExc_ValueError, "embedded null character");
                     RETURN_ERR_OCCURRED;
                 }