Improve preprocessor by using GLSL scanner, allowing read-only strings to be compiled, unifying of line # tracking, and correct detection that ES #version appeared after a comment.


git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@23721 e7fa87d3-cd2b-0410-9028-fcbf551c1848