add a test loader for SponzaScene
WIP : introduce MaterialConverter to convert a from regular Lighting material to GBuffer material
WIP: add ambient light
add support of albedoMap, specularMap => add gbuffer for albedo and specular (TODO remove from  MatIdManger)
+ fix read of source material in MaterialConverter
fix WorldParemeters used debuging DefferedTexture :
- inject WorldParameters used to generate buffers and don't use current one (eg gbuffer in 3D viewport, debug into 2D Gui viewport)
- convert DebugTextureViewer into an AppState
- add debug for positions and specular
SponzaScene: experiement loader/converter
Sample01: update scene
- to no longer use local jme' s testdata, but assets from jme3stuff
- to alternate mesh and color in central block
- to center teapot
- directionnal + ambient light
Sample01HDR: Sample01 + HDRRenderer
ambient : take care of albedo
Pass4AO: restore H+V blur
shader: experiment reconstruct world position with ViewProjectionMatrixInverse instead of G3D' reconstructCSPositionFromDepth
set LBuffer to RGB8