Core: Ensure we don't strip api or plugin members

Author: SamboyCoding

Diff for: Cpp2IL.Core/Cpp2IL.Core.csproj

@@ -28,6 +28,12 @@
         <IsTrimmable>true</IsTrimmable>
     </PropertyGroup>
 
+    <ItemGroup Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net7.0'))">
+        <EmbeddedResource Include="TrimmerRoots.xml">
+            <LogicalName>ILLink.Descriptors.xml</LogicalName>
+        </EmbeddedResource>
+    </ItemGroup>
+
     <PropertyGroup Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net8.0'))">
         <IsAotCompatible>true</IsAotCompatible>
     </PropertyGroup>

Diff for: Cpp2IL.Core/TrimmerRoots.xml

@@ -0,0 +1,6 @@
+<linker>
+    <assembly fullname="Cpp2IL.Core">
+        <type fullname="Cpp2IL.Core.Cpp2IlApi" preserve="all" />
+        <type fullname="Cpp2IL.Core.Api.Cpp2IlPlugin" preserve="all" />
+    </assembly>
+</linker>