Add separate .targets file for .NET projects.

Done to make it easier to use Image3dAPI from .NET/C# projects.

PackagingGE/Image3dAPI.net.targets

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <!-- .NET/C# project config -->
+  <Target Name="InjectReference" BeforeTargets="ResolveAssemblyReferences">
+    <ItemGroup Condition="'$(Platform)' == 'Win32' or '$(Platform)' == 'x86'">
+      <Reference Include="Image3dAPI">
+        <HintPath>$(MSBuildThisFileDirectory)..\native\lib\Win32\Image3dAPI.dll</HintPath>
+        <EmbedInteropTypes>true</EmbedInteropTypes>
+      </Reference>
+    </ItemGroup>
+    <ItemGroup Condition="'$(Platform)' == 'x64'">
+      <Reference Include="Image3dAPI">
+        <HintPath>$(MSBuildThisFileDirectory)..\native\lib\x64\Image3dAPI.dll</HintPath>
+        <EmbedInteropTypes>true</EmbedInteropTypes>
+      </Reference>
+    </ItemGroup>
+  </Target>
+</Project>

PackagingGE/Image3dAPI.nuspec

@@ -20,7 +20,8 @@
     </metadata>
 
     <files>
-        <file src="Image3dAPI.targets" target="build/native/" />
+        <file src="Image3dAPI.targets"     target="build/native/" />
+        <file src="Image3dAPI.net.targets" target="build/net/Image3dAPI.targets" />
 
         <!-- support headers -->
         <file src="../Image3dAPI/ComSupport.hpp" target="build/native/include/Image3dAPI/" />