Initial changes for building for IOS using toolchain ios-cmake and XCode cmake generator.
Use better platform test in Version cmake file when working with multiple toolchains.
Re-enable use of glconsole when using OpenGL ES 2. Compiles and partly works with text rendering issue.
Add .DS_Store to gitignore.
Start to experiment with IOS ViewController.
Rendering working on IOS.
Guard 'precision medium float' shader calls on desktop.