Ground work to get plugins functional again

MediaBrowser.Common/MediaBrowser.Common.csproj

@@ -1,5 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
+  <PropertyGroup>
+    <Authors>Jellyfin Contributors</Authors>
+    <PackageId>Jellyfin.Common</PackageId>
+  </PropertyGroup>
+
   <ItemGroup>
     <ProjectReference Include="..\MediaBrowser.Model\MediaBrowser.Model.csproj" />
   </ItemGroup>

MediaBrowser.Controller/MediaBrowser.Controller.csproj

@@ -1,5 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
+  <PropertyGroup>
+    <Authors>Jellyfin Contributors</Authors>
+    <PackageId>Jellyfin.Controller</PackageId>
+  </PropertyGroup>
+
   <ItemGroup>
     <ProjectReference Include="..\MediaBrowser.Model\MediaBrowser.Model.csproj" />
     <ProjectReference Include="..\MediaBrowser.Common\MediaBrowser.Common.csproj" />

MediaBrowser.Model/MediaBrowser.Model.csproj

@@ -1,5 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
+  <PropertyGroup>
+    <Authors>Jellyfin Contributors</Authors>
+    <PackageId>Jellyfin.Model</PackageId>
+  </PropertyGroup>
+
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>