Shaders: vertex VectorShader is implementation independent.

Renamed it to AbstractVectorShader.

src/Shaders/CMakeLists.txt

@@ -1,7 +1,8 @@
 corrade_add_resource(MagnumShaders_RCS MagnumShaders
+    AbstractVectorShader2D.vert AbstractVectorShader3D.vert
     FlatShader2D.vert FlatShader3D.vert FlatShader.frag
     PhongShader.vert PhongShader.frag
-    VectorShader2D.vert VectorShader3D.vert VectorShader.frag
+    VectorShader.frag
     VertexColorShader2D.vert VertexColorShader3D.vert VertexColorShader.frag
     compatibility.glsl)
 set(MagnumShaders_SRCS

src/Shaders/VectorShader.cpp

@@ -25,8 +25,8 @@ namespace Magnum { namespace Shaders {
 
 namespace {
     template<UnsignedInt> constexpr const char* vertexShaderName();
-    template<> constexpr const char* vertexShaderName<2>() { return "VectorShader2D.vert"; }
-    template<> constexpr const char* vertexShaderName<3>() { return "VectorShader3D.vert"; }
+    template<> constexpr const char* vertexShaderName<2>() { return "AbstractVectorShader2D.vert"; }
+    template<> constexpr const char* vertexShaderName<3>() { return "AbstractVectorShader3D.vert"; }
 }
 
 template<UnsignedInt dimensions> VectorShader<dimensions>::VectorShader(): transformationProjectionMatrixUniform(0), colorUniform(1) {