This patch renames some unit actors for consistency with their templates (and icons):
- move infantry_crossbowman_c.xml from athenians/ to macedonians/
- renames kushites/camelry_* to kushites/camel_*
- renames kushites/infantry_clubman_* to kushites/infantry_maceman_*
- renames persians/cavalry_swordsman_* to persians/cavalry_axeman_*
- renames ptolemies/camelry_* to ptolemies/camel_*