String has method chaining for property setting
Fix Character positions after String::resize -- needed if center or right justified
Add String::width()
Permute code in final.frag
Enable depth sorting of tetrahedra
Move cloud magnitude from blue to alpha channel
Move brightness adjustment before chromaticity calculation
Clean up component extraction from integrated density texture
Move brightness adjustment from final compositing to cloud rendering
Move exponential falloff to beginning of final compositing step
Remove unused depth_obscuration switch
Move exponential falloff into cloud fragment shader and adjust blending
Fix division by zero
Use BlendFuncSeparate to eliminate a multiply
Minor adjustment