At the moment the 'make test' cannot be run non-interactively yet on Linux host and Mac OS X host systems due to what-could-be a bug in 'emrun' script. The issue with 'emrun' has been reported to upstream (https://github.com/kripken/emscripten/issues/3234).
Changes:
- Avoid globbing engine source files twice.
- Setup folder group for VS and Xcode. Also group object files according to 3rd-party library name.
- New define_source_files() macro.
Added diffuse unlit & notexture unlit techniques.
Do not use occlusion if viewport is very tall compared to width, as the pixel width of the occlusion buffer is fixed and would result in large CPU time consumption.
