Provide use localtime option on FileTime handling

[cosmo0920]

Currently, we're assuming UTC implicitly on FileTime handling:

winevt_c/ext/winevt/winevt_utils.cpp

Lines 714 to 741 in 9bcea01

	if (EvtVarTypeNull != pRenderedValues[EvtSystemTimeCreated].Type) {
	ullTimeStamp = pRenderedValues[EvtSystemTimeCreated].FileTimeVal;
	ft.dwHighDateTime = (DWORD)((ullTimeStamp >> 32) & 0xFFFFFFFF);
	ft.dwLowDateTime = (DWORD)(ullTimeStamp & 0xFFFFFFFF);
	FileTimeToSystemTime(&ft, &st);
	ullNanoseconds =
	(ullTimeStamp % 10000000) *
	100; // Display nanoseconds instead of milliseconds for higher resolution
	_snprintf_s(buffer,
	_countof(buffer),
	_TRUNCATE,
	"%02d/%02d/%02d %02d:%02d:%02d.%llu",
	st.wYear,
	st.wMonth,
	st.wDay,
	st.wHour,
	st.wMinute,
	st.wSecond,
	ullNanoseconds);
	rb_hash_aset(hash,
	rb_str_new2("TimeCreated"),
	rb_str_new2(buffer));
	} else {
	rb_hash_aset(hash,
	rb_str_new2("TimeCreated"),
	Qnil);
	}

This is because FileTimeToSystemTime just handles FileTime as UTC.
If we want to convert this UTC based FileTime, we have to call FileTimeToLocalFileTime before calling FileTimeToSystemTime API.
This default behavior is reasonable for western countries. But, for Asia-Pacific countries, its quite weird impressions for some users.