This merge removes some redundant-looking code that was apparently
included in DFC upstream already.
This merge also reverts some whitespace & reformatting changes in the
`src/` directory so that a `git diff dragonfire/master` contains only
the essential differences.
This permits to make evidence that we have some bad object passing on various code parts. I fixed majority of them to reduce the scope of passed objects
Unfortunately, for some edge cases i should have to expose ISceneManager from client, this should be fixed in the future when our POO will be cleaner client side (we have a mix of rendering and processing in majority of the client objects, it works but it's not clean)
* we don't need on CAO side more than SceneManager, and temporary. Pass only required SceneManager as a parameter to build CAO and add them to the current scene
* Use temporary the RenderingEngine singleton from ClientEnvironment, waitfor for better solution
* Make ClientActiveObject::addToScene virtual function mandatory to be defined by children to ensure we don't forget to properly define it
* No more access to the singleton instance from everywhere (RenderingEngine::get_instance dropped)
* RenderingEngine::get_timer_time is now non static
* RenderingEngine::draw_menu_scene is now non static
* RenderingEngine::draw_scene is now non static
* RenderingEngine::{initialize,finalize} are now non static
* RenderingEngine::run is now non static
* RenderingEngine::getWindowSize now have a static helper. It was mandatory to hide the global get_instance access
Make the RenderingEngine filesystem member non accessible from everywhere
This permits also to determine that some lua code has directly a logic to extract zip file. Move this logic inside client, it's not the lua stack role to perform a such complex operation
Found also another irrlicht <1.8 compat code to remove
