Remove explicit default destructors (#157)

From CppCoreGuidelines:

Rule of Zero: C.20: If you can avoid defining default operations, do.
C.52: Use inheriting constructors to import constructors into a derived class that does not need further explicit initialization.
DRY forward and using declarations.
Miscellaneous:

Fix format.sh to output examples with normalised paths in sorted order.

Co-authored-by: ArthurSonzogni <sonzogniarthur@gmail.com>

src/ftxui/component/container.cpp

@@ -53,8 +53,6 @@ class ContainerBase : public ComponentBase {
     return container;
   }
 
-  ~ContainerBase() override = default;
-
   // Component override.
   bool OnEvent(Event event) override {
     if (event.is_mouse())