Add function to create Modloader mac version after build

Author: dani0105

ModLoader/ModLoader.csproj

@@ -111,7 +111,7 @@
       <Version>2.2.0</Version>
     </PackageReference>
   </ItemGroup>
-  <Target Name="ILMerge">
+  <Target Name="AfterBuild">
     <!-- the ILMergePath property points to the location of ILMerge.exe console application -->
     <Exec Command="$(ILMergeConsolePath) /out:bin/Release/ModLoaderMac.dll bin/Release/0Harmony.dll bin/Release/ModLoader.dll" />
   </Target>