adding opengl example. step one: build opengl app
...huh. The naive impl causes the http_control to constantly overwrite the keyboard input. I can either rethink the placement of the http update, or register the var in keyboard (but this is bad, not how a nice library should act), or use get_internal_copy and somehow detect when I should overwrite?
dunno if this is the best solution... also, the floats application values aren't being shown in the web interface, big bad bug... and wrapping them in an object is not the soln