Port most shaders to GLSL ES 3.0 (#16639)

irr/include/IVideoDriver.h

@@ -63,6 +63,8 @@ struct SFrameStats {
 };
 
 struct SDriverLimits {
+	//! Major and minor GL version
+	core::vector2di GLVersion;
 	//! Maximum amount of primitives that can be rendered in a single call
 	u32 MaxPrimitiveCount = 0;
 	//! Maximum width/height for a texture