WIP Remove unused input-related code

src/activators/pressedmove.js

src/activators/reversey.js

src/activators/shortpress.js

src/components/input-configurator.js

src/components/super-spawner.js

src/hub.html

src/hub.js

src/input-mappings.js

src/scene-entry-manager.js

src/systems/userinput/userinput.js

src/utils/action-event-handler.js

src/utils/gearvr-mouse-events-handler.js

src/utils/mouse-events-handler.js

src/utils/touch-events-handler.js