Restructure 3

[xEnVrE]

This PR is the fourth of a series incorporating commits from claudiofantacci/bayes-filters-lib and xenvre/bayes-filters-lib.

In this PR:

New interfaces

• Add Skipper interface modelling skipping functionalities
• Add Filter interface class describing Bayes filter functionalities

Use of new interfaces in existing classes

• Skippable inherits from Skipper
• FilteringAlgorithm inherits form Filter
• FilteringAlgorithm inherits form Skipper

Change in FilteringAlgorithm interface

• initialization() renamed to initialization_step()
• isRunning() renamed to is_running()
• filteringRecursion() renamed to filtering_recursion()
• filteringStep() renamed to step_number()
• runCondition() renamed to run_condition()

Change in GaussianFilter interface

• add method predition() returning reference to the underlying GaussianPrediction predition_ (now private)
• add method correction() returning reference to the underlying GaussianCorrection correction_ (now private)

Change in ParticleFilter interface

• add method initialization() returning reference to the underlying ParticleSetInitialization initialization_
• add method prediction() returning reference to the underlying PFPrediction prediction_ (now private)
• add method correction() returning reference to the underlying PFCorrection correction_ (now private)
• add method resampling() returning reference to the underlying Resampling resampling_

Misc.

• Skippable::getSkipState() is renamed in Skippable::is_skipping()
• Add default ctor in class FilteringAlgorithm
• Add default dtor in classes GaussianFilter, SIS
• Delete copy constructor/assignment and default move constructor/assignment in classes FilteringAlgorithm, GaussianFilter, ParticleFilter, SIS
• Move SIS::log_file_names implementation from .h. to .cpp
• Add default argument const bfl::Data& data = Data() to {PFCorrection, GaussianCorrection}::freeze_measurements() such that it can be passed to the underlying MeasurementModel::freeze(const bfl::Data&)

Tests

Tests have been updated accordingly

Changelog

Changelog has been updated accordingly

Fixes #72

[xEnVrE]

I am going to merge if there are not other comments :) @claudiofantacci

[claudiofantacci]

Yes please, go on :-)