libpacman: Make Package::backup not a pointer.
libpacman: Make Package::m_depends not a pointer.
libpacman: Make Package::removes not a pointer.
libpacman: Add move constructor to FPtrList.
libpacman: Add a basic FStringList class with copy and move initialisers.
libpacman: Make Package::requiredby not a pointer.
libpacman: Remove now unused _pacman_list_strdup.
libpacman: Make Package::m_conflict not a pointer.
libpacman: Make Package::m_provides not a pointer.