WOLF class and files names convention

We should revise some classes according to the convention for names (from general to specific).

We may want to write them down and adding some other decisions like:

• use of capitals for abbreviations (IMU, GNSS, etc.). I would propose not using capitals (It would make clearer the classes names: ProcessorGnssTdcp instead of ProcessorGNSSTDCP). Now there is a mix.
• include classes and objects in the ROS wrappers.