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/toggle.cpp

@@ -29,8 +29,6 @@ class ToggleBase : public ComponentBase {
              Ref<ToggleOption> option)
       : entries_(entries), selected_(selected), option_(std::move(option)) {}
 
-  ~ToggleBase() override = default;
-
  private:
   Element Render() override {
     Elements children;