Feature set as pointers for polymorphisme
Merge branch 'master' into feat_ptr

Conflicts:
	modules/ThumbnailWriter/ThumbnailWriter.cpp
	vp-detection
Fix one error with Features pointers
Implement a FeaturePtr class and pass unit tests
Minor change
Inherit a FeatureFloat feature. Nor fully working
Use new features for tracking
Add serialization to features
Fix serialization
Added support for new features in FilterObjects. Untested
Small change in bulk/Event.h. Rename method