Mark OLESEN authored Nov 01, 2022 and Andrew Heather committed Nov 24, 2022

- traditionally used first(), last() methods,
  but front(), back() are well-known from std::vector etc
  which makes the access more familiar.

- support push_back() method for containers that already had append().
  This increases name familiar and can help when porting between
  different C++ code bases.

- support pop_back() method for List containers.
  This is similar to std::vector