message: GLSL: varying seems to be deprecated
diff: @@ -85,7 +85,7 @@ string const& GLTextShaper::vertexShaderCode()
  static string const code = R"(
  #version 330
  in vec4 vertex;
  - varying vec2 TexCoords;
  + out vec2 TexCoords;
  uniform mat4 projection;
  