Rename Source validation extension

RhSolutions.AddIn/Controllers/RibbonController.cs

@@ -93,7 +93,7 @@ public class RibbonController : ExcelRibbon
         else
         {
             Worksheet worksheet = RhSolutionsAddIn.Excel.ActiveWorkbook.ActiveSheet;
-            return worksheet.IsRehauSource();
+            return worksheet.IsValidSource();
         }
     }
 

RhSolutions.AddIn/Services/RhExcelReader.cs

@@ -83,7 +83,7 @@ public class RhExcelReader : IExcelReader, IDisposable
         List<(string, Dictionary<Product, double>)> result = new();
         foreach (Worksheet worksheet in worksheets)
         {
-            if (!worksheet.IsRehauSource())
+            if (!worksheet.IsValidSource())
             {
                 continue;
             }

RhSolutions.AddIn/Services/RhExcelWriter.cs

@@ -42,7 +42,7 @@ public class RhExcelWriter : IExcelWriter, IDisposable
     {
         _worksheet = OpenNewPrice();
 
-        if (!_worksheet.IsRehauSource())
+        if (!_worksheet.IsValidSource())
         {
             _application.ActiveWorkbook.Close();
             throw new ArgumentException(

RhSolutions.AddIn/Services/WorksheetExtensions.cs

@@ -9,7 +9,7 @@ namespace RhSolutions.Services;
 #endif
 public static class WorksheetExtensions
 {
-    public static bool IsRehauSource(this Worksheet worksheet)
+    public static bool IsValidSource(this Worksheet worksheet)
     {
         Range amountCell;
         Range skuCell;