Hide standard Python libraries in cechomesh.

[rec]

Things like six and math shouldn't be visible.

['AudioLoudness', 'AudioRingBuffer', 'AudioSource', 'COMPARE_MAP', 'Color', 'ColorList', 'LOADED', 'PyLightingWindow', 'PyRingBufferIndex', 'Transform', '_EPSILON', '__builtins__', '__doc__', '__file__', '__name__', '__package__', '__test__', '_conv', '_ensure_length', '_even_color_slots', '_make_list', '_near_zero', '_to_list', 'color_list_with_errors', 'color_spread', 'combine_color_lists', 'combine_to_spi', 'compare_ints', 'compute_rows', 'concatenate_color_lists', 'default_input_device', 'default_output_device', 'default_output_sample_rate', 'even_color_spread', 'fill_spi', 'get_device_names', 'get_spi_order', 'init_log', 'insert_color_list', 'interpolate_hue', 'is_started', 'math', 'mirror_color_list', 'scroll_color_list', 'set_logger', 'six', 'start_application', 'stop_application', 'tile_color_list', 'to_color_list', 'traceback']