Refactoring to adhere to naming convetions from googles style guide

demos/optical_bench/src/controller_overlay.cpp

demos/optical_bench/src/controller_overlay.hpp

demos/optical_bench/src/file_reader_zmx.cpp

demos/optical_bench/src/file_reader_zmx.hpp

demos/optical_bench/src/hmd_navigation_behavior.cpp

demos/optical_bench/src/hmd_navigation_behavior.hpp

demos/optical_bench/src/laser_menu.cpp

demos/optical_bench/src/laser_menu.hpp

demos/optical_bench/src/lens.cpp

demos/optical_bench/src/lens.hpp

demos/optical_bench/src/lens_menu.cpp

demos/optical_bench/src/lens_menu.hpp

demos/optical_bench/src/menu_button.cpp

demos/optical_bench/src/menu_button.hpp

demos/optical_bench/src/menu_helper.hpp

demos/optical_bench/src/menu_manager.cpp

demos/optical_bench/src/menu_manager.hpp

demos/optical_bench/src/menu_slider.cpp

demos/optical_bench/src/menu_slider.hpp

demos/optical_bench/src/menu_switch.cpp