Abstract asset loading to asset manager

Dengine.vcxproj

@@ -120,17 +120,21 @@
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
+    <ClCompile Include="src\AssetManager.cpp" />
     <ClCompile Include="src\dengine.cpp" />
     <ClCompile Include="src\Shader.cpp" />
+    <ClCompile Include="src\Texture.cpp" />
   </ItemGroup>
   <ItemGroup>
     <None Include="data\shaders\default.frag.glsl" />
     <None Include="data\shaders\default.vert.glsl" />
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="src\include\Dengine\AssetManager.h" />
     <ClInclude Include="src\include\Dengine\Common.h" />
     <ClInclude Include="src\include\Dengine\OpenGL.h" />
     <ClInclude Include="src\include\Dengine\Shader.h" />
+    <ClInclude Include="src\include\Dengine\Texture.h" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">