nodeparamview: added icon to "edit text in viewer" button

app/ui/icons/icons.cpp

@@ -91,6 +91,7 @@ QIcon icon::EyeOpened;
 QIcon icon::EyeClosed;
 QIcon icon::LockOpened;
 QIcon icon::LockClosed;
+QIcon icon::Pencil;
 
 void icon::LoadAll(const QString& theme)
 {
@@ -161,6 +162,8 @@ void icon::LoadAll(const QString& theme)
   EyeClosed = Create(theme, "eye-closed");
   LockOpened = Create(theme, "lock-opened");
   LockClosed = Create(theme, "lock-closed");
+
+  Pencil = Create(theme, "text-edit");
 }
 
 QIcon icon::Create(const QString& theme, const QString &name)

app/ui/icons/icons.h

@@ -103,6 +103,7 @@ extern QIcon EyeOpened;
 extern QIcon EyeClosed;
 extern QIcon LockOpened;
 extern QIcon LockClosed;
+extern QIcon Pencil;
 
 /**
  * @brief Create an icon object loaded from file