quickly corrected the previous refactoring of features2d: moved from set(SOME_PROP, val) to setSomeProp(val)

1. someMatrix.data -> someMatrix.prt()
2. someMatrix.data + someMatrix.step * lineIndex -> someMatrix.ptr( lineIndex )
3. (SomeType*) someMatrix.data -> someMatrix.ptr<SomeType>()
4. someMatrix.data -> !someMatrix.empty() ( or !someMatrix.data -> someMatrix.empty() ) in logical expressions

	deleted:    src/CsvReader.h
	deleted:    src/CsvWriter.cpp
	deleted:    src/CsvWriter.h
	deleted:    src/Mesh.cpp
	deleted:    src/Mesh.h
	deleted:    src/Model.cpp
	deleted:    src/Model.h
	deleted:    src/ModelRegistration.cpp
	deleted:    src/ModelRegistration.h
	deleted:    src/PnPProblem.cpp
	deleted:    src/PnPProblem.h
	deleted:    src/RobustMatcher.cpp
	deleted:    src/RobustMatcher.h
	deleted:    src/Utils.cpp
	deleted:    src/Utils.h
	deleted:    src/main_detection.cpp
	deleted:    src/main_registration.cpp
	deleted:    src/main_verification.cpp
	deleted:    src/test_pnp.cpp