2.5.0: Added cras_bag_tools, fixed RVL decoder

cras_bag_tools

* filter_bag: Split into a reusable module, added more filters and example configs.
* topic_set: Support iteration over TopicSet.
* extract_images: Support global speedup setting.
* filter_bag: Refactor.
* filter_bag: Rewritten to use image_transport_codecs
* Added extract_images
* Added filter_bag
* Contributors: Martin Pecka

cras_cpp_common

• No changes

cras_docs_common

• No changes

cras_py_common

* plugin_utils: Fixed Python 2.7 compatibility.
* Added plugin_utils.
* string_utils: Added pretty_file_size()
* message_utils: Added msg_to_raw and raw_to_msg
* Fixed dependencies.
* image_encodings: Added isDepth().
* Added image_encodings.py and distortion_models.py .
* Contributors: Martin Pecka

cras_topic_tools

• No changes

image_transport_codecs

* Fixed RVL decoder incorrectly marking some images as malformed.
  Apparently, the compression ratio can get better that 5:1 (happens mostly in images with large NaN areas).
* Contributors: Martin Pecka