Remove imports

Elwig/Helpers/Config.cs

@@ -1,5 +1,4 @@
-using System;
-using System.IO;
+using System.IO;
 using System.Text;
 using IniParser;
 using IniParser.Model;

Elwig/Helpers/Gradation.cs

@@ -1,10 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace Elwig.Helpers {
+namespace Elwig.Helpers {
     // 1 °KMW = 
     // 1 °NM  = kg/100L = 10g/L
     // 1 °Oe  = 

Elwig/Helpers/Validator.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Threading.Tasks;
 using System.Windows.Controls;
 using Elwig.Models;