Add LethalConfig with suitable custom options

The custom callback attempts to prevent modifications mid-round. Use
IsHost to check for permissions, as IsClient is always true for
everyone even in local single-player setting.

There is a bug in LethalConfig which makes it possible to modify entries
bypassing the callback once per round, but it is pretty hard to abuse:
https://github.com/AinaVT/LethalConfig/issues/60

MuzikaGromche/MuzikaGromche.csproj

@@ -15,10 +15,7 @@
         <PackageReference Include="BepInEx.PluginInfoProps" Version="1.*"/>
         <PackageReference Include="UnityEngine.Modules" Version="2022.3.9" IncludeAssets="compile"/>
         <PackageReference Include="BepInEx.AssemblyPublicizer.MSBuild" Version="0.4.1" PrivateAssets="all" />
-        <!--
+        <!-- Publicize internal methods, so we could generate config entries for tracks at runtime instead of generating code at compile time -->
-            Publicize internal methods, so we could generate config entries for tracks at runtime instead
-            of generating code at compile time. See https://github.com/lc-sigurd/CSync/issues/11
-        -->
         <PackageReference Include="Sigurd.BepInEx.CSync" Version="5.0.1" Publicize="true" />
         <PackageReference Include="AinaVT-LethalConfig" Version="1.4.6" />
     </ItemGroup>

MuzikaGromche/Plugin.cs

@@ -313,7 +313,6 @@ namespace MuzikaGromche
             }
 
             // HACK because CSync doesn't provide an API to register a list of config entries
-            // See https://github.com/lc-sigurd/CSync/issues/11
             foreach (var track in Plugin.Tracks)
             {
                 // This is basically what ConfigFile.PopulateEntryContainer does