added c_menu_button classe to reduce c_menu class and to do of c_menu a base class heritade by c_menu_button
moved data for a menu button from c_menu to c_menu_button
in c_menu class changed variables from protected to private and rename with name norme
no need this code line because she bind the 'q' touch for leave program when the file menu is open, and the 'q' touch is already binded for leave menu when any menu is open, and the pointer function "&leave_menu_file_callback" is already binded on last element of file menu here: file src/c_menu.cpp line: 290