Modernising the code, improving images

src/Cxx/Medical/GenerateCubesFromLabels.cxx

src/Cxx/Medical/GenerateCubesFromLabels.md

src/Cxx/Medical/GenerateModelsFromLabels.cxx

src/Cxx/Medical/GenerateModelsFromLabels.md

src/Cxx/Medical/MedicalDemo1.cxx

src/Cxx/Medical/MedicalDemo1.md

src/Cxx/Medical/MedicalDemo2.cxx

src/Cxx/Medical/MedicalDemo2.md

src/Cxx/Medical/MedicalDemo3.cxx

src/Cxx/Medical/MedicalDemo3.md

src/Cxx/Medical/MedicalDemo4.cxx

src/Cxx/Medical/MedicalDemo4.md

src/Cxx/Medical/TissueLens.cxx

src/Cxx/Medical/TissueLens.md

src/Python/Medical/MedicalDemo1.md

src/Python/Medical/MedicalDemo1.py

src/Python/Medical/MedicalDemo2.md

src/Python/Medical/MedicalDemo2.py

src/Python/Medical/MedicalDemo3.md

src/Python/Medical/MedicalDemo3.py