standardise SimpleSoundManager entry class & prevent other mods from accessing its mod helper

GeneralMods/SimpleSoundManager/Class1.cs

@@ -1,21 +0,0 @@
-using StardewModdingAPI;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace SimpleSoundManager
-{
-    public class Class1 :Mod
-    {
-        public static IModHelper ModHelper;
-
-        public override void Entry(IModHelper helper)
-        {
-            ModHelper = helper;       
-            
-        }
-
-    }
-}

GeneralMods/SimpleSoundManager/SimpleSoundManager.csproj

@@ -34,7 +34,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
-    <Compile Include="Class1.cs" />
+    <Compile Include="SimpleSoundManagerMod.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="SoundManager.cs" />
   </ItemGroup>

GeneralMods/SimpleSoundManager/SimpleSoundManagerMod.cs

@@ -0,0 +1,14 @@
+using StardewModdingAPI;
+
+namespace SimpleSoundManager
+{
+    public class SimpleSoundManagerMod : Mod
+    {
+        internal static IModHelper ModHelper;
+
+        public override void Entry(IModHelper helper)
+        {
+            ModHelper = helper;
+        }
+    }
+}