LazUtils: TXmlReader/Writer, always encode #0 / accept encoded #0 in input if xrfAllowSpecialCharsInAttributeValue is set.

components/lazutils/laz2_xmlread.pas

@@ -1904,7 +1904,7 @@ begin
     until Value > $10FFFF;
 
     case Value of
-      $01..$08, $0B..$0C, $0E..$1F:
+      $00..$08, $0B..$0C, $0E..$1F:
         if FXML11 or (xrfAllowSpecialCharsInAttributeValue in FFlags) then
           BufAppend(ToFill, DOMChar(Value))
         else

components/lazutils/laz2_xmlwrite.pas

@@ -171,7 +171,7 @@ end;
 const
   AttrSpecialChars : array[boolean] of TSetOfChar = (
     ['<', '"', '''', '&', #0..#31], // false: default
-    ['<', '"', '''', '&']  // true: write special characters
+    ['<', '"', '''', '&', #0]  // true: write special characters
     );
   TextSpecialChars = ['<', '>', '&', #0..#31];
   CDSectSpecialChars = [']'];