Add basic entity shading

[Furzide]

this is not a request for anything that is impossible, I am just asking if you can customise the actor and other entity related shader code so the colour and lighting of entities match the rest of the scene, like terrain. the source code for actor and other stuff is available and mostly bug free, and will make your shader look way more polished. You had it in your old HAL version, so maybe you can port the tonemap code over to the new codebase. :)