Some character reference formats not parsed correctly

[Pharb]

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• [x] Have you included sample input, output, error, and expected output?
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Description

According to this [XML spec](https://www.w3.org/TR/xml/#dt-charref), character references can include leading zeros and lower-case letters in hexadecimal representation. Personally I encountered this parsing issue by consuming XML provided by a proprietary third-party tool, which includes references in the style of `<`. ### Input

<?xml version="1.0"?>
<tests>
  <test>&lt;</test>
  <test>&#60;</test>
  <test>&#060;</test>
  <test>&#0060;</test>
  <test>&#x3C;</test>
  <test>&#x03C;</test>
  <test>&#x003C;</test>
  <test>&#x3c;</test>
  <test>&#x03c;</test>
  <test>&#x003c;</test>
</tests>

Code

const parser = new XMLParser();
let result = parser.parse(xmlData, true);

Output

{
    "?xml": "",
    "tests": {
        "test": [
            "<",
            "<",
            "&#060;",
            "&#0060;",
            "<",
            "&#x03C;",
            "&#x003C;",
            "&#x3c;",
            "&#x03c;",
            "&#x003c;"
        ]
    }
}

expected data

{
    "?xml": "",
    "tests": {
        "test": [
            "<",
            "<",
            "<",
            "<",
            "<",
            "<",
            "<",
            "<",
            "<",
            "<",
        ]
    }
}

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• [x] Yes

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