Adds -O1 to Matrix.cpp in iOS project file

This remedies crashes in iOS release builds that seem to be caused by optimisations.
Merge pull request #873 from WolfgangD/master

Adds -O1 to Matrix.cpp in iOS project file
Adds missing uniform u_spotLightDirection to colored shader
Merge pull request #890 from ChrisWiki/master

Bugfix: u_spotLightDirection was missing in colored fragment shader
Remove Visual Studio files
Added CMake compatibility with Windows/MSVC
Merge pull request #938 from Kernald/cmake-windows

CMake support for Windows/MSVC