SIC standardized pre-defined messages

The SIC framework includes a number of predefined extended subclasses for common data types. This allows for inheritance. Make sure to use or extend these classes if the data type you will be working with matches one of these pre-defined types.

The message can be found in https://bitbucket.org/socialroboticshub/docker/src/v3/sic/sic_framework/core/data_python2.py.

Message class name	Description of use
`JPEGCompressedImageMessage`	Preferred way of sending any message containing an image. Uses lossy JPEG compression on WxHx3 images. Non-image content will be destroyed by this compression.
`UncompressedImageMessage`	Same as `JPEGCompressedImageMessage`, but without compression. This means that this message can be significantly slower. Only use this if the image data must be kept untouched.
`AudioMessage`	Preferred way of sending a message containing audio. The audio must contain pulse-code modulated (PCM) 16-bit signed integer waveform audio data.
`BoundingBoxesMessage`	Preferred way of sending any message containing a list of `BoundingBox` objects. The `BoundingBox` is a generic class for single bounding boxes in `x,y,w,h`-format. `x,y` represents top-left pixel. Bounding boxes can easily be drawn by calling `draw_on_image`.