High-dpi and browser zoom setting..

This release has the following changes:

 1) phong shading now works differently. I'm now using blinn-phong.
 2) high-dpi and browser zoom setting now implemented
 3) brightness of the gltf models can now be adjusted with 2 new settings/self_multiplier and rest_multiplier allows easy tweaking of the rendering brightness
 4) bug fixes about progress display logo and bm_2d for high-dpi displays
 5) deployment also supports high-dpi displays.