Add usings back to project templates

Fixes picoe#2619

Author: cwensley

src/Eto.Forms.Templates/content/App-CSharp/EtoApp.1/MainForm.cs

@@ -1,4 +1,8 @@
 #if (UseCode || UseCodePreview)
+using System;
+using Eto.Forms;
+using Eto.Drawing;
+
 namespace EtoApp._1
 {
 public partial class MainForm : Form

src/Eto.Forms.Templates/content/App-CSharp/EtoApp.1/MainForm.eto.cs

@@ -1,4 +1,8 @@
 #if (UseCodePreview)
+using System;
+using Eto.Forms;
+using Eto.Drawing;
+
 namespace EtoApp._1
 {
 partial class MainForm : Form

src/Eto.Forms.Templates/content/App-CSharp/EtoApp.1/MainForm.jeto.cs

@@ -1,4 +1,8 @@
 #if (UseJeto)
+using System;
+using System.Collections.Generic;
+using Eto.Forms;
+using Eto.Drawing;
 using Eto.Serialization.Json;
 
 namespace EtoApp._1

src/Eto.Forms.Templates/content/App-CSharp/EtoApp.1/MainForm.xeto.cs

@@ -1,4 +1,8 @@
 #if (UseXeto)
+using System;
+using System.Collections.Generic;
+using Eto.Forms;
+using Eto.Drawing;
 using Eto.Serialization.Xaml;
 
 namespace EtoApp._1

src/Eto.Forms.Templates/content/App-CSharp/EtoApp.1/Program.cs

@@ -1,4 +1,8 @@
-namespace EtoApp._1
+using System;
+using Eto.Forms;
+using Eto.Drawing;
+
+namespace EtoApp._1
 {
 class Program
 {

src/Eto.Forms.Templates/content/App-CSharp/Separate/EtoApp.1.Gtk/Program.cs

@@ -1,4 +1,7 @@
-namespace EtoApp._1.Gtk
+using System;
+using Eto.Forms;
+
+namespace EtoApp._1.Gtk
 {
 class Program
 {

src/Eto.Forms.Templates/content/App-CSharp/Separate/EtoApp.1.Mac/Program.cs

@@ -1,4 +1,7 @@
-namespace EtoApp._1.Mac
+using System;
+using Eto.Forms;
+
+namespace EtoApp._1.Mac
 {
 class Program
 {

src/Eto.Forms.Templates/content/App-CSharp/Separate/EtoApp.1.MacOS/Program.cs

@@ -1,4 +1,7 @@
-namespace EtoApp._1.Mac
+using System;
+using Eto.Forms;
+
+namespace EtoApp._1.Mac
 {
 class Program
 {

src/Eto.Forms.Templates/content/App-CSharp/Separate/EtoApp.1.WinForms/Program.cs

@@ -1,4 +1,7 @@
-namespace EtoApp._1.WinForms
+using System;
+using Eto.Forms;
+
+namespace EtoApp._1.WinForms
 {
 class Program
 {

src/Eto.Forms.Templates/content/App-CSharp/Separate/EtoApp.1.Wpf/Program.cs

@@ -1,4 +1,7 @@
-namespace EtoApp._1.Wpf
+using System;
+using Eto.Forms;
+
+namespace EtoApp._1.Wpf
 {
 class Program
 {