(X)HTML warning when `[` or `]` in constructed ids

When we have a construct like:
```
template <typename Element, size_t N>
class StlContainerView<Element[N]> {
 public:
  typedef internal::NativeArray<RawElement> type;
};
```
this will lead to files with `[` and `]` in it, as such not nice, but it is used in ids inside the code as well like:
```
id="aclass_stl_container_view_3_01_element[_n]_4_html_a1bf60158ff15896f2b53af11c09524fb"
```
running
```
xmllint --path ..../testing/dtd --noout  --nonet --postvalid html_org/*html
```
this leads to the message:
```
Syntax of value for attribute id of div is not valid
Document html_org/test_8h_source.html does not validate
```

escaping the `[` and `]` as done with other special characters solves this problem

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