Big menu update (Menu now has real backgrounds and the right images/colors) :)

demos/optical_bench/src/controller_overlay.cpp

demos/optical_bench/src/controller_overlay.hpp

demos/optical_bench/src/hmd_navigation_behavior.cpp

demos/optical_bench/src/laser_menu.cpp

demos/optical_bench/src/lens_menu.cpp

demos/optical_bench/src/menu_button.cpp

demos/optical_bench/src/menu_button.hpp

demos/optical_bench/src/menu_slider.hpp

demos/optical_bench/src/menu_switch.hpp

demos/optical_bench/src/object_menu.cpp

demos/optical_bench/src/test_pattern_frame.cpp

...ls/opticalBench/controller_overlay/Controller_Buttons.mtl

...ls/opticalBench/controller_overlay/Controller_Buttons.obj

resources/models/opticalBench/controller_overlay/Grip.png

...urces/models/opticalBench/controller_overlay/Trackpad.png

resources/models/opticalBench/controller_overlay/Trigger.png

...els/opticalBench/controller_overlay/menu_images/Grip1.png

...els/opticalBench/controller_overlay/menu_images/Grip2.png

...els/opticalBench/controller_overlay/menu_images/Grip3.png

...Bench/controller_overlay/menu_images/Grip_Select_Left.png