Add BlueHighway signed distance field font. Using UBFG tool to build the SDF font. For more information, please refer to https://github.com/aster2013/UBFG. Special thanks https://github.com/scriptum/UBFG/.
Add text shader.
Add Use SDF option to Text3D to enable signed distance field text.
Add Lua and AngelScript SDF samples.
Fix Text3D::SetFont AS binding bug.
Add Stroke testing shader code.[ci skip]
Add Use SDF in Text class.
Update BlueHighway.fnt, [ci skip].
Remove .fnt font files and .sdf font files. [ci skip]
Remove useSDF parameter in Text and Text3D classes, now signed distance field font is a bitmap font file with .sdf extension.
Merge branch 'sdf-font'
For Travis CI - switch CI build to use OS X build environment.