OS independent file paths & Utility.PathCombine added

System.IO.Path.Combine provides cross-platform support for system paths, however rooted paths discarding of earlier segments
Utilities.PathCombine ensures if any parameters start with root chacters does not discard previous Utilities.PathCombine allows appending of "\\" to translate to the correct cross-platform result

Oqtane.Shared/Shared/Utilities.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Globalization;
+using System.IO;
 using System.Text;
 using System.Text.RegularExpressions;
 
@@ -236,5 +237,21 @@ namespace Oqtane.Shared
                   @"(?(\[)(\[(\d{1,3}\.){3}\d{1,3}\])|(([0-9a-z][-0-9a-z]*[0-9a-z]*\.)+[a-z0-9][\-a-z0-9]{0,22}[a-z0-9]))$",
                   RegexOptions.IgnoreCase, TimeSpan.FromMilliseconds(250));
         }
+
+        public static string PathCombine(params string[] segments)
+        {
+            var separators = new char[] { Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar };
+
+            for (int i =1;i < segments.Length; i++){
+                if(Path.IsPathRooted(segments[i])){
+                    segments[i] = segments[i].TrimStart(separators);
+                    if(String.IsNullOrEmpty(segments[i])){
+                        segments[i]=" ";
+                    }
+                }
+            }
+            
+            return Path.Combine(segments).TrimEnd(); 
+        }
     }
 }