Prefer 'using' to 'typedef' in examples

Summary

• Replace typedef with using in all C++ examples
• clang-format all examples again

Rationale

'using' is generally prefered in modern C++. It's important here because examples are part of the documentation (cookbook). It could be done for the rest of the code, but it's much less important.

Part of #1865

Copyright

The copyright owner is CNES and has signed the ORFEO ToolBox Contributor License Agreement.

---

Check before merging:

• All discussions are resolved
• At least 2 votes from core developers, no vote.
• The feature branch is (reasonably) up-to-date with the base branch
• Dashboard is green
• Copyright owner has signed the ORFEO ToolBox Contributor License Agreement
• Optionally, run git diff develop... -U0 --no-color | clang-format-diff.py -p1 -i on latest changes and commit

Examples/Application/ApplicationExample.cxx

@@ -42,10 +42,10 @@ public:
   // Class declaration is followed by \code{ITK} public types for the class, the superclass and
   // smart pointers.
 
-  typedef ApplicationExample            Self;
-  typedef Application                   Superclass;
-  typedef itk::SmartPointer<Self>       Pointer;
-  typedef itk::SmartPointer<const Self> ConstPointer;
+  using Self         = ApplicationExample;
+  using Superclass   = Application;
+  using Pointer      = itk::SmartPointer<Self>;
+  using ConstPointer = itk::SmartPointer<const Self>;
 
   //  Following macros are necessary to respect ITK object factory mechanisms. Please report
   //  to \ref{sec:FilterConventions} for additional information.