Can add a optional for compare ALL node name by ignore-case ? [enhancement] about pugixml HOT 2 CLOSED

XML is usually case sensitive, so case insensitive comparisons are rarely needed.
Additionally, implementing a correct Unicode-aware case-sensitive comparison is relatively involved.

Both of these combined mean that this feature does not really fit pugixml. It should be straightforward to implement custom functions that you may need as helpers, e.g. xml_node child_ignorecase_ascii(xml_node, const char*) in your header file.

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To author: Thanks for an amazing product, I have used for everything for 3-4 years now :)
I have made a "version" og PUGI-XML has has child_no_case() and atrribute_no_case() added methods,

PUGI_IMPL_FN xml_node xml_node::child_no_case(const char_t* name_) const
{
	if (!_root) return xml_node();

	for (xml_node_struct* i = _root->first_child; i; i = i->next_sibling)
	{
		const char_t* iname = i->name;			
		if (iname &&  toUpper(name_) == toUpper(iname))			
			return xml_node(i);
	}

	return xml_node();
}

and similar for attribute, i have recent had "toUpper/toLower" code fixed to avoid to signed char issue,,,
https://en.cppreference.com/w/cpp/string/byte/toupper#:~:text=current%20C%20locale.-,Notes,-Like%20all%20other
so it should be legal enough?
it is not like it is rocket-science, I but could look at how portable my code is, and maybe push it?
There is also a simple way to make the whole library case-insentive, by changing impl::strequal() perhaps with conditional compiling ofc you guys are coders, you you know already :)

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