Invert coupling from Core to Logging

SabreTools.Core/Tools/Converters.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using SabreTools.Logging;
 
 namespace SabreTools.Core.Tools
 {
@@ -8,6 +9,23 @@ namespace SabreTools.Core.Tools
     {
         #region String to Enum
 
+        /// <summary>
+        /// Get the LogLevel value for an input string, if possible
+        /// </summary>
+        /// <param name="value">String value to parse/param>
+        /// <returns></returns>
+        public static LogLevel AsLogLevel(this string? value)
+        {
+            return value?.ToLowerInvariant() switch
+            {
+                "verbose" => LogLevel.VERBOSE,
+                "user" => LogLevel.USER,
+                "warning" => LogLevel.WARNING,
+                "error" => LogLevel.ERROR,
+                _ => LogLevel.VERBOSE,
+            };
+        }
+
         /// <summary>
         /// Get bool? value from input string
         /// </summary>