Stock: add Waypoint list and support functions.
Waypoint:
- Use an unordered_set instead of a vector for the Building list.
- Add functions add_building(), add_buildings() and remove_building().
- Add operator string().
cfg/waypoints.csv: change format (add building name).
Building:
- Display areas & waypoints statistics in operator<<().
- Use an unordered_map for areas.
- Use an unordered_set for waypoints.
(instead of two vectors)
Area: display building name in operator<<().
In cxxtest, TS_ASSERT_DIFFERS(a, b) tests !(a == b) and not (a != b).
Therefore, to test a::operator!=(b), we must avoid TS_ASSERT_DIFFERS()
(that will test !a::operator==(b)) and write instead TS_ASSERT(a != b).