Light PrePass in the editor

I made some fixes so I can have more than 1 light and their contribution nicely accumulates in the light buffer. Moreover, I fixed some minor bugs so I can use all that in my editor and move the camera and lights easily. It's not that much but I'll just put a screenshot :

I hope I'll have some more time this week to work on point and directional lights as well as improving the point lights (by drawing a 3D sphere or a 2D billboard instead of a fullscreen quad). And also more time to posts details about all that, with code snippets maybe :)

-m