Reduce shape vertex size to 8 floats

It is not at all clear whether this is an improvement or not

shader/shape/basic.vert

@@ -1,6 +1,6 @@
 #version 450 core
 //struct PosColNorm { vec4 pos;   vec4 norm;uint col; uint dummy; };
-struct PosColNorm { vec4 pos;  uint norm;uint d1;uint d2; uint d3;uint col; uint dummy; };
+struct PosColNorm { vec4 pos;  uint norm;uint col; };
 // I don't know if the dummy is necessary
 layout (std140, binding = 0) uniform TheMat { mat4 theMat; } ;
 layout (std430, binding = 3) readonly buffer Data { PosColNorm data[]; };