Add location decorators & change to use structs as in/out in glsl, update embedded spv (produced with glslangValidator -x)

examples/vulkan_example/glsl_shader.frag

@@ -1,9 +1,9 @@
 #version 450 core
-layout(location = 0, index = 0) out vec4 fColor;
+layout(location = 0) out vec4 fColor;
 
 layout(set=0, binding=0) uniform sampler2D sTexture;
 
-in block{
+layout(location = 0) in struct{
     vec4 Color;
     vec2 UV;
 } In;