Added more thread safty to ClearSSLSessions

Now it should be safe to use even if another thread is in the middle of storing a session before we disable it.

@@ -75,6 +75,7 @@ namespace LIL_VSTT_Plugins
             System.Reflection.Assembly asm = System.Reflection.Assembly.GetAssembly(typeof(System.Net.Security.SslStream));
             Type t = asm.GetType("System.Net.Security.SslSessionsCache");
             System.Reflection.FieldInfo f = t.GetField("s_CachedCreds", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Static);
+            lock (f.GetValue(null))
                 f.SetValue(null, new ZeroHashtable());
         }
 
@@ -83,6 +84,7 @@ namespace LIL_VSTT_Plugins
             System.Reflection.Assembly asm = System.Reflection.Assembly.GetAssembly(typeof(System.Net.Security.SslStream));
             Type t = asm.GetType("System.Net.Security.SslSessionsCache");
             System.Reflection.FieldInfo f = t.GetField("s_CachedCreds", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Static);
+            lock (f.GetValue(null))
                 f.SetValue(null, new System.Collections.Hashtable(32));
         }
     }