More graphics updates

- Add shadow to grass hut (based on cave hut's shadow)
- Two new town graphics by ADoS
- New hut on hills.
- Desaturate snow/water shores to reduce weird purplish streaks
- Fix water tone in ice/water shores
- Add 3-way ice/water/snow shores
- Remove duplicate snow/ice shore

rsrc/graphics/CREDITS.md

@@ -59,8 +59,11 @@ Some sheets are entirely original:
 For terrain graphics, most are original BoE graphics, except for the following (some of
 which are based on original BoE graphics):
 
-- On ter5.png, graphics 20-23 and 33 are by Mistb0rn. Graphics 18, 19, 25 are by ADoS.
-Graphics 24 and 46-49 were monster graphics in original BoE.
+- On ter4.png, the grass hut is basically original BoE but had a shadow added by
+Celtic Minstrel.
+- On ter5.png, graphics 20-23 and 33 are by Mistb0rn. Graphics 2, 3, 18, 19, 25 are by ADoS.
+Graphics 24 and 46-49 were monster graphics in original BoE. Graphic 4 is by Celtic Minstrel
+based on original BoE graphics.
 - ter6.png is entirely by Mistb0rn.
 - ter7.png is by Mistb0rn, except the small trees (54 and 46) which are by Celtic
 Minstrel.