improve AppVersion.Parse

-> ignore version at the start and trim

Pilz.Updating/AppVersion.cs

@@ -62,7 +62,13 @@ public class AppVersion(Version version, int build, Channels channel)
 
     public static AppVersion Parse(string input)
     {
-        var splitted = input.Split(' ');
+        if (string.IsNullOrWhiteSpace(input))
+            throw new FormatException();
+
+        if (input.StartsWith("version", StringComparison.InvariantCultureIgnoreCase))
+            input = input[7..];
+
+        var splitted = input.Trim().Split(' ');
 
         if (splitted.Length < 1 || !Version.TryParse(splitted[0], out Version? version) || version == null)
             throw new FormatException();