Renamed in templates/units to apply a consistent naming scheme:
* all champion files
* all *_kardakes_* files
* all *_marine files
* all *_merc_* files
* Greek thorakites and thureophoros files
Furthermore:
* applied “equine transport” requirement to Persian trireme
* removed now obsolete pers_cavalry_*_trireme files
* Athenian docks can no longer train marine soldiers (to prevent other factions from training their own units at captured Athenian docks).
* the cart *_gaul, *_iber, *_ital files are kept unchanged for now.