We can use a std::string here instead of setting up a scope guard and
manual allocations. We also don't need to care about null-termination,
as c_str() will automatically ensure this is done when passing it into
ini_parse_string().
* fs.mitm: Fix mismatched new[] / delete
Using delete instead of delete[] on a pointer given by new[] is
undefined behaviour.
For memory sources, malloc/free are used because cleaning up is tricky
when data can be either allocated with new (RomfsHeader) or new[]
(metadata).
* set.mitm: Fix mismatched new[] / delete
