- multiple 3d view fixes and improvements
 * fixed #104 forced manual filter /mip map for the grid labels for less bluriness
 * fixed #103 : z-fighting issues between the grid elements/shadows and various transparent objects: this was solved thanks to better z offsets for the grid elements, and setting a bigger NEAR value
for the main camera in the 3d view
 * also fixed #102 : various visual styles for the 3d shapes are now applied correctly, to all the hierachy (and not just some top level elements etc)