Rename Convert to Converters to not clash with system one.

Microsoft.Toolkit.Services/Services/OneDrive/OneDriveStorageItem.cs

@@ -70,7 +70,7 @@ namespace Microsoft.Toolkit.Services.OneDrive
         {
             get
             {
-                return FileSize.HasValue ? Convert.ToFileSizeString(FileSize.Value) : Convert.ToFileSizeString(0L);
+                return FileSize.HasValue ? Converters.ToFileSizeString(FileSize.Value) : Converters.ToFileSizeString(0L);
             }
         }
 

Microsoft.Toolkit.Uwp.UI/Converters/FileSizeToFriendlyStringConverter.cs

@@ -8,7 +8,7 @@ using Windows.UI.Xaml.Data;
 namespace Microsoft.Toolkit.Uwp.UI.Converters
 {
     /// <summary>
-    /// Converts a file size in bytes to a more human-readable friendly format using <see cref="Toolkit.Convert.ToFileSizeString(long)"/>
+    /// Converts a file size in bytes to a more human-readable friendly format using <see cref="Toolkit.Converters.ToFileSizeString(long)"/>
     /// </summary>
     public class FileSizeToFriendlyStringConverter : IValueConverter
     {
@@ -17,7 +17,7 @@ namespace Microsoft.Toolkit.Uwp.UI.Converters
         {
             if (value is long size)
             {
-                return Toolkit.Convert.ToFileSizeString(size);
+                return Toolkit.Converters.ToFileSizeString(size);
             }
 
             return string.Empty;

Microsoft.Toolkit/Converters.cs

@@ -11,7 +11,7 @@ namespace Microsoft.Toolkit
     /// <summary>
     /// Set of helpers to convert between data types and notations.
     /// </summary>
-    public static class Convert
+    public static class Converters
     {
         /// <summary>
         /// Translate numeric file size in bytes to a human-readable shorter string format.