This patch:
* Moves the //gastraphetophoros// crossbowman actor from the athenians/ to the macedonians/ folder, as it is a Macedonian (untrainable) unit.
* Renames the Nuba mercenary actor to `infantry_maceman_*`, and also moves its icon (split from D1354).
* Renames the Hyrcanian cavalry actor to `cavalry_axeman_*`, and also moves its icon (split from D1355).
Art files names ought to be descriptive, not prescriptive. The weapon of the Nuba “clubman” is clearly a mace (it has 3×6 variants, but all consist of a stick with a clearly visible macehead) and that of the Hyrcanian “swordsman” is a //sagaris// (axe).
Naming is consistent with e.g. `kushites/infantry_axeman_c.xml` and `mauryas/infantry_maceman_c.xml`.
Similar patches include D2530 and D2636.