freeze designer support assembly version.

src/Avalonia.DesignerSupport/Avalonia.DesignerSupport.csproj

@@ -1,7 +1,12 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
-    <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
+    <!-- WARNING! The designer support version number needs to be frozen 
+         To allow projects that implement designer functionality to still
+         work with newer versions of Avalonia. This version number only
+         need change when there are breaking changes to designer support api.
+    -->
+    <Version>0.7.0</Version>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">
     <DebugSymbols>true</DebugSymbols>
@@ -37,11 +42,6 @@
     <ProjectReference Include="..\Avalonia.Styling\Avalonia.Styling.csproj" />
     <ProjectReference Include="..\Avalonia.Themes.Default\Avalonia.Themes.Default.csproj" />
   </ItemGroup>
-  <ItemGroup>
-    <Compile Include="..\Shared\SharedAssemblyInfo.cs">
-      <Link>Properties\SharedAssemblyInfo.cs</Link>
-    </Compile>
-  </ItemGroup>
   <Import Project="..\..\build\Microsoft.CSharp.props" />
   <Import Project="..\..\build\Rx.props" />
 </Project>