Form disposal on client disconnection

Added disposal method to dispose of all userstate forms for client upon
disconnection of the client from the server

Server/Core/Server.cs

@@ -264,6 +264,8 @@ private void HandleState(Client s, bool open)
             {
                 _clients.Remove(s);
                 OnClientState(s, false);
+
+                s.Value.DisposeForms();
             }
         }
     }

Server/Core/UserState.cs

@@ -37,5 +37,23 @@ public UserState()
             LastDesktopSeen = true;
             LastDirectorySeen = true;
         }
+
+        public void DisposeForms()
+        {
+            if (FrmRdp != null)
+                FrmRdp.Close();
+            if (FrmTm != null)
+                FrmTm.Close();
+            if (FrmFm != null)
+                FrmFm.Close();
+            if (FrmSi != null)
+                FrmSi.Close();
+            if (FrmSm != null)
+                FrmSm.Close();
+            if (FrmRs != null)
+                FrmRs.Close();
+            if (FrmStm != null)
+                FrmStm.Close();
+        }
     }
 }