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>

doc/example_list.md

@@ -1,46 +1,46 @@
 # Examples
-@example ./examples/util/print_key_press.cpp
-@example ./examples/dom/color_truecolor_HSV.cpp
-@example ./examples/dom/dbox.cpp
-@example ./examples/dom/separator.cpp
-@example ./examples/dom/style_color.cpp
-@example ./examples/dom/color_info_palette256.cpp
-@example ./examples/dom/color_truecolor_RGB.cpp
-@example ./examples/dom/paragraph.cpp
-@example ./examples/dom/style_blink.cpp
-@example ./examples/dom/style_dim.cpp
-@example ./examples/dom/style_inverted.cpp
-@example ./examples/dom/graph.cpp
-@example ./examples/dom/package_manager.cpp
-@example ./examples/dom/window.cpp
-@example ./examples/dom/html_like.cpp
-@example ./examples/dom/border.cpp
-@example ./examples/dom/style_underlined.cpp
-@example ./examples/dom/color_gallery.cpp
-@example ./examples/dom/gauge.cpp
-@example ./examples/dom/style_bold.cpp
-@example ./examples/dom/spinner.cpp
-@example ./examples/dom/style_gallery.cpp
-@example ./examples/dom/vbox_hbox.cpp
-@example ./examples/dom/size.cpp
-@example ./examples/dom/hflow.cpp
-@example ./examples/component/tab_vertical.cpp
-@example ./examples/component/gallery.cpp
+@example ./examples/component/button.cpp
 @example ./examples/component/checkbox.cpp
 @example ./examples/component/checkbox_in_frame.cpp
-@example ./examples/component/menu2.cpp
-@example ./examples/component/resizable_split.cpp
-@example ./examples/component/tab_horizontal.cpp
-@example ./examples/component/slider.cpp
-@example ./examples/component/input.cpp
-@example ./examples/component/homescreen.cpp
-@example ./examples/component/radiobox.cpp
-@example ./examples/component/menu_multiple.cpp
-@example ./examples/component/slider_rgb.cpp
-@example ./examples/component/menu.cpp
-@example ./examples/component/menu_style.cpp
-@example ./examples/component/radiobox_in_frame.cpp
 @example ./examples/component/composition.cpp
-@example ./examples/component/button.cpp
-@example ./examples/component/toggle.cpp
+@example ./examples/component/gallery.cpp
+@example ./examples/component/homescreen.cpp
+@example ./examples/component/input.cpp
+@example ./examples/component/menu2.cpp
+@example ./examples/component/menu.cpp
+@example ./examples/component/menu_multiple.cpp
+@example ./examples/component/menu_style.cpp
 @example ./examples/component/modal_dialog.cpp
+@example ./examples/component/radiobox.cpp
+@example ./examples/component/radiobox_in_frame.cpp
+@example ./examples/component/resizable_split.cpp
+@example ./examples/component/slider.cpp
+@example ./examples/component/slider_rgb.cpp
+@example ./examples/component/tab_horizontal.cpp
+@example ./examples/component/tab_vertical.cpp
+@example ./examples/component/toggle.cpp
+@example ./examples/dom/border.cpp
+@example ./examples/dom/color_gallery.cpp
+@example ./examples/dom/color_info_palette256.cpp
+@example ./examples/dom/color_truecolor_HSV.cpp
+@example ./examples/dom/color_truecolor_RGB.cpp
+@example ./examples/dom/dbox.cpp
+@example ./examples/dom/gauge.cpp
+@example ./examples/dom/graph.cpp
+@example ./examples/dom/hflow.cpp
+@example ./examples/dom/html_like.cpp
+@example ./examples/dom/package_manager.cpp
+@example ./examples/dom/paragraph.cpp
+@example ./examples/dom/separator.cpp
+@example ./examples/dom/size.cpp
+@example ./examples/dom/spinner.cpp
+@example ./examples/dom/style_blink.cpp
+@example ./examples/dom/style_bold.cpp
+@example ./examples/dom/style_color.cpp
+@example ./examples/dom/style_dim.cpp
+@example ./examples/dom/style_gallery.cpp
+@example ./examples/dom/style_inverted.cpp
+@example ./examples/dom/style_underlined.cpp
+@example ./examples/dom/vbox_hbox.cpp
+@example ./examples/dom/window.cpp
+@example ./examples/util/print_key_press.cpp