Modern settings shell folder

Adds virtual shell folder that contains items representing modern settings parsed from
`%windir%\ImmersiveControlPanel\Settings\AllSystemSettings_{253E530E-387D-4BC2-959D-E6F86122E5F2}.xml`.

It can be accessed via `shell:::{82E749ED-B971-4550-BAF7-06AA2BF7E836}` (in explorer).

Item in folder will open given setting page in `Settings` application.

Src/StartMenu/StartMenuHelper/ModernSettings.h

@@ -0,0 +1,139 @@
+// Modern settings helper
+
+#pragma once
+
+#include <functional>
+#include <map>
+#include <string>
+#include <vector>
+
+struct Blob
+{
+	const void* data = nullptr;
+	size_t size = 0;
+};
+
+class File
+{
+public:
+	File(const WCHAR* fileName, DWORD desiredAccess, DWORD shareMode, DWORD creationDisposition = OPEN_EXISTING, DWORD flagsAndAttributes = FILE_ATTRIBUTE_NORMAL)
+	{
+		m_handle = ::CreateFile(fileName, desiredAccess, shareMode, nullptr, creationDisposition, flagsAndAttributes, nullptr);
+	}
+
+	~File()
+	{
+		if (m_handle != INVALID_HANDLE_VALUE)
+			::CloseHandle(m_handle);
+	}
+
+	File(const File&) = delete;
+	File& operator=(const File&) = delete;
+
+	explicit operator bool() const
+	{
+		return (m_handle != INVALID_HANDLE_VALUE);
+	}
+
+	operator HANDLE() const
+	{
+		return m_handle;
+	}
+
+	uint64_t size() const
+	{
+		LARGE_INTEGER li = {};
+		return ::GetFileSizeEx(m_handle, &li) ? li.QuadPart : (uint64_t)-1;
+	}
+
+private:
+	HANDLE m_handle;
+};
+
+class MappedFile
+{
+public:
+	MappedFile(const WCHAR* fileName) : m_file(fileName, GENERIC_READ, FILE_SHARE_READ|FILE_SHARE_DELETE)
+	{
+		if (m_file)
+		{
+			auto mapping = ::CreateFileMapping(m_file, nullptr, PAGE_READONLY, 0, 0, nullptr);
+			if (mapping)
+			{
+				m_view.data = ::MapViewOfFile(mapping, FILE_MAP_READ, 0, 0, 0);
+				if (m_view.data)
+					m_view.size = (size_t)m_file.size();
+
+				::CloseHandle(mapping);
+			}
+		}
+	}
+
+	~MappedFile()
+	{
+		if (m_view.data)
+			::UnmapViewOfFile(m_view.data);
+	}
+
+	MappedFile(const MappedFile&) = delete;
+	MappedFile& operator=(const MappedFile&) = delete;
+
+	explicit operator bool() const
+	{
+		return (m_view.data != nullptr);
+	}
+
+	Blob get() const
+	{
+		return m_view;
+	}
+
+private:
+	File m_file;
+	Blob m_view;
+};
+
+class ModernSettings
+{
+public:
+	ModernSettings(const wchar_t* fname);
+
+	size_t size() const
+	{
+		return m_settings.size();
+	}
+
+	struct Setting
+	{
+		std::wstring_view fileName;
+
+		std::wstring_view deepLink;
+		std::wstring_view icon;
+		std::wstring_view glyph;
+
+		std::wstring_view pageId;
+		std::wstring_view hostId;
+		std::wstring_view groupId;
+		std::wstring_view settingId;
+		std::wstring_view description;
+		std::wstring_view keywords;
+
+		Setting() = default;
+		Setting(const Blob& blob);
+
+		explicit operator bool() const
+		{
+			return !fileName.empty();
+		}
+	};
+
+	std::vector<Setting> enumerate() const;
+	Setting get(const std::wstring_view& name) const;
+
+private:
+	MappedFile m_storage;
+	std::map<std::wstring_view, Blob> m_settings;
+};
+
+// retrieve actual instance of ModernSettings
+std::shared_ptr<ModernSettings> GetModernSettings();