shading language (glsl) downgraded to version 110 for better compatibility with older systems

lib/visualization/shader/frag.glsl

-#version 150
+#version 110
 
 varying vec4 v_color;
 void main() {

lib/visualization/shader/grid_vertex.glsl

 // vertex shader for the GridProgram
 
-#version 150
+#version 110
 // position vector of location model or direction line VBO 0
 attribute vec3 position;
 // normal vector of location model face VBO 0

lib/visualization/shader/offset_color_carry_vertex.glsl

 // vertex shader for the OffsetColorCarryProgram
 
-#version 150
+#version 110
 
 // VBO 0 - per vertex
 // vector of a face

lib/visualization/shader/offset_color_vertex.glsl

 // vertex shader for the OffsetColorProgram
 
-#version 150
+#version 110
 
 // VBO 0 - per vertex
 // vector of a face