Remove unused imports

Author: alex-ilin

Visual Studio Project Template C#/PluginInfrastructure/GatewayDomain.cs

@@ -1,7 +1,6 @@
 // NPP plugin platform for .Net v0.94.00 by Kasper B. Graversen etc.
 using System;
 using System.Runtime.InteropServices;
-using System.Text;
 
 namespace Kbg.NppPluginNET.PluginInfrastructure
 {

Visual Studio Project Template C#/PluginInfrastructure/Preference_h.cs

@@ -4,10 +4,6 @@
 // "notepad-plus-plus/scintilla/include/Scintilla.iface"
 // found at
 // https://github.com/notepad-plus-plus/notepad-plus-plus/blob/master/scintilla/include/Scintilla.iface
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
 
 namespace NppPluginNET.PluginInfrastructure
 {

Visual Studio Project Template C#/PluginInfrastructure/resource_h.cs

@@ -4,10 +4,6 @@
 // "notepad-plus-plus/scintilla/include/Scintilla.iface"
 // found at
 // https://github.com/notepad-plus-plus/notepad-plus-plus/blob/master/scintilla/include/Scintilla.iface
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
 using Kbg.NppPluginNET.PluginInfrastructure;
 
 namespace NppPluginNET.PluginInfrastructure