Update to Imageflow .NET 0.7.22

* Fix P/Invoke problem in 32-bit mode (x86)
* Optimize PNG and WebP filesize when converting from WebP by decoding without alpha when appropriate
* Fix compositing when the canvas is a decoded PNG (Fixes imazen/imageflow#580)

Author: lilith

src/Imageflow.Server/Imageflow.Server.csproj

@@ -19,11 +19,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Imageflow.NativeRuntime.osx-x86_64" Version="1.5.6-rc60" />
-    <PackageReference Include="Imageflow.NativeRuntime.ubuntu_16_04-x86_64" Version="1.5.6-rc60" />
-    <PackageReference Include="Imageflow.NativeRuntime.win-x86" Version="1.5.6-rc60" />
-    <PackageReference Include="Imageflow.NativeRuntime.win-x86_64" Version="1.5.6-rc60" />
-    <PackageReference Include="Imageflow.Net" Version="0.7.20" />
+    <PackageReference Include="Imageflow.AllPlatforms" Version="0.7.22" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All" />
   </ItemGroup>