Revert "Add #version 120 to make shaders work on Windows"

USL-32

This breaks OpenGL shaders on Windows and Mac.

plugins/LayerView/layers.shader

@@ -1,6 +1,5 @@
 [shaders]
 vertex =
-    #version 120
     uniform highp mat4 u_modelViewProjectionMatrix;
     uniform lowp float u_active_extruder;
     uniform lowp float u_shade_factor;
@@ -29,7 +28,6 @@ vertex =
     }
 
 fragment =
-    #version 120
     varying lowp vec4 v_color;
     varying float v_line_type;
 

plugins/LayerView/layerview_composite.shader

@@ -1,6 +1,5 @@
 [shaders]
 vertex =
-    #version 120
     uniform highp mat4 u_modelViewProjectionMatrix;
     attribute highp vec4 a_vertex;
     attribute highp vec2 a_uvs;
@@ -14,7 +13,6 @@ vertex =
     }
 
 fragment =
-    #version 120
     uniform sampler2D u_layer0;
     uniform sampler2D u_layer1;
     uniform sampler2D u_layer2;

resources/shaders/grid.shader

@@ -1,6 +1,5 @@
 [shaders]
 vertex =
-    #version 120
     uniform highp mat4 u_modelViewProjectionMatrix;
 
     attribute highp vec4 a_vertex;
@@ -15,7 +14,6 @@ vertex =
     }
 
 fragment =
-    #version 120
     uniform lowp vec4 u_gridColor0;
     uniform lowp vec4 u_gridColor1;
 

resources/shaders/overhang.shader

@@ -1,6 +1,5 @@
 [shaders]
 vertex =
-    #version 120
     uniform highp mat4 u_modelMatrix;
     uniform highp mat4 u_viewProjectionMatrix;
     uniform highp mat4 u_normalMatrix;
@@ -22,7 +21,6 @@ vertex =
     }
 
 fragment =
-    #version 120
     uniform mediump vec4 u_ambientColor;
     uniform mediump vec4 u_diffuseColor;
     uniform mediump vec4 u_specularColor;

resources/shaders/striped.shader

@@ -1,6 +1,5 @@
 [shaders]
 vertex =
-    #version 120
     uniform highp mat4 u_modelMatrix;
     uniform highp mat4 u_viewProjectionMatrix;
     uniform highp mat4 u_normalMatrix;
@@ -24,7 +23,6 @@ vertex =
     }
 
 fragment =
-    #version 120
     uniform mediump vec4 u_ambientColor;
     uniform mediump vec4 u_diffuseColor1;
     uniform mediump vec4 u_diffuseColor2;

resources/shaders/transparent_object.shader

@@ -1,6 +1,5 @@
 [shaders]
 vertex =
-    #version 120
     uniform highp mat4 u_modelMatrix;
     uniform highp mat4 u_viewProjectionMatrix;
     uniform highp mat4 u_normalMatrix;
@@ -22,7 +21,6 @@ vertex =
     }
 
 fragment =
-    #version 120
     uniform mediump vec4 u_ambientColor;
     uniform mediump vec4 u_diffuseColor;
     uniform highp vec3 u_lightPosition;