TODO: Move file metadata to separate table
cxxll::file_handle::file_handle(const char *, const char *): Fix argument name
cxxll::malloc_handle::get(): Add const version
cxxll::file_handle::line: New class

Adjust file_handle::getline() to use this new class.
cxxll::os_exception::function_name(): Add setters
cxxll::read_lines(const char *, std::vector<std::string> &): Add