Examples: SDL+DX11: Changelog, readme, batch files, fixed vcxproj, minor stylistic fixes + minor sync of other main.cpp files. (#2632)

examples/example_glfw_metal/main.mm

@@ -74,6 +74,7 @@ int main(int, char**)
 
     MTLRenderPassDescriptor *renderPassDescriptor = [MTLRenderPassDescriptor new];
 
+    // Our state
     bool show_demo_window = true;
     bool show_another_window = false;
     float clear_color[4] = {0.45f, 0.55f, 0.60f, 1.00f};