libpacman: Fix some typo/missing conversions of keyed_value in flib::set.
libpacman: Add flib::keyed_value_traits<libpacman::package_node_ptr>.
libpacman: Add flib::str some compare/contains methods.
libpacman: Add missing const to flib::list::any_match_if.
libpacman: Propagate templates arguments when invoking falgorithms methods in flib (allow to bypass some compiler error due to bad type guess).
libpacman: Drop f_stringlist_any_match.
libpacman: Remove a variable name shadowing when loading .fpm files in _pacman_fpmpackage_load.