[BLEUNW/EVENTS/MANAGER]: rennamed and moved event_manager to events::manager
[KLMB/SAMPLE/TEST]: modified the sample to be ok with the change in bleunw::events
[YAGGLER/CMAKE/FLAGS]: removed extra -fno-rtti
[BLEUNW/APP|SCENE|EVENTS]: introducing scene and application, updated events to allow window event to be listened.
[KLMB/SAMPLE/TEST]: updated test sample to use :bleunw application
[YAGGLER/GLFW/WINDOW]: window is now 'ownership' compliant.
[KLMB/CAMERA/HOLDER]: camera holder is now able to give back the holded camera.