Fixed skill icons not displaying correctly.

- Minor balance changes
- Added support for many weapon mods (including Sharp and Serrated)
- Three new unique scythe/sickle types
- All-new item art by OnlyFangs

Iron sickle tile now displays correctly
Scythes are now slightly less likely to show up in loot and merchant inventories (still may adjust down in future to avoid drowning the market in scythes)
Harvester calling adjusted (Stat bonus: +2 Strength > +2 Toughness, now spawns with one-handed sickle instead of scythe)
The ready for harvest effect can now be re-applied to refresh the duration
New dependency: Tyrir's Hot 'n Spicy History

First commit