This patch:
- renames a few weapon props:
- akin → akinakes
- gladus → gladius
- kush_khopesh_bronze → khopesh
- knife → dagger
- merges kush_gladius.xml, rome_cav_gladius.xml, and spatha.xml, since they're essentially the same
- deprecates *_kush.xml and *_ptol.xml variants of camelry slaughter attack and gather meat, since their generic camel parent variant is more appropiate