Add a new shader-versioning infrastructure capable of handling multiple profiles, desktop/ES, many versions, features coming and going in different versions across different profiles, and extensions.

NB: *Use* of this infrastructure is so far only skeletal.

Fixed a few typos and minor issues along the way.


git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@19951 e7fa87d3-cd2b-0410-9028-fcbf551c1848

glslang/MachineIndependent/ShaderLang.cpp

@@ -282,6 +282,8 @@ int ShCompile(
     
     GenerateBuiltInSymbolTable(resources, compiler->infoSink, &symbolTable, compiler->getLanguage());
 
+    // TODO: this is happening *after* initialization, which already parsed some things... what parse context was that?
+    // what extensions did it have?
     TParseContext parseContext(symbolTable, intermediate, compiler->getLanguage(), compiler->infoSink);
     parseContext.initializeExtensionBehavior();