Make component more functionnal

CMakeLists.txt

doc/example_list.md

doc/mainpage.md

examples/component/CMakeLists.txt

examples/component/button.cpp

examples/component/checkbox.cpp

examples/component/checkbox_in_frame.cpp

examples/component/gallery.cpp

examples/component/homescreen.cpp

examples/component/input.cpp

examples/component/menu.cpp

examples/component/menu2.cpp

examples/component/menu_style.cpp

examples/component/modal_dialog.cpp

examples/component/radiobox.cpp

examples/component/radiobox_in_frame.cpp

examples/component/slider.cpp

examples/component/tab_horizontal.cpp

examples/component/tab_vertical.cpp

examples/component/toggle.cpp