Add faces for knowledge dialogs.

COPYING.rtro

@@ -17,6 +17,10 @@ charcoal: Derived from Saiapatsu's base set charcoal image, licensed CC-0.
 misc/go/point, stone_(white|black): Derived from art by Kevin Zheng, licensed CC-BY-3.0.
 handmirror: Referenced base set handmirror, licensed CC-BY-4.0.
 grand_piano_black, grand_piano_white: Reference photo by Joe Haupt (https://www.flickr.com/photos/51764518@N02/49286256543), licensed CC-SA-2.0
+knowledge_generic: Rederived from source of base image (http://commons.wikimedia.org/w/index.php?title=File:HREpolitics.svg&oldid=58248760), licensed CC-BY-SA-3.0.
+knowledge_messages: Rederived from source of base image (http://commons.wikimedia.org/w/index.php?title=File:Temple_Scroll.png&oldid=65512408), public domain.
+knowledge_monsters: Rederived from source of base image (http://commons.wikimedia.org/w/index.php?title=File:Dragon.svg&oldid=65944895), licensed CC-BY-SA-3.0.
+knowledge_recipes: Rederived from source of base image (http://www.nasa.gov/mission_pages/hubble/science/hst_img_20080520.html), public domain.
 
 Derivatives of unknown licensing:
 capitalhold_west: Referenced from base image capitalhold_west, of unknown licensing.

ChangeLog.rtro

@@ -12,6 +12,11 @@ Changes for top of trunk
 	  misc/Container/chest_yellow_1.rtro.111.png: Recolor the various chests to match color in base. Maintained XPM palette.
 	* misc/music/grand_piano_black.rtro.x11.png,
 	  misc/music/grand_piano_white.rtro.111.png: New art for grand piano. Now adheres to XPM palette.
+	* system/knowledge/knowledge_generic.rtro.111.png,
+	  system/knowledge/knowledge_messages.rtro.111.png,
+	  system/knowledge/knowledge_monsters.rtro.111.png,
+	  system/knowledge/knowledge_recipes.rtro.111.png: Rederived from sources used in base image set. Reduced to XPM palette.
+	    Pretty sure JXClient uses these for a knowledge dialog, and possibly other nonstandard clients, too.
 
 2023-03-13 Daniel Hawkins
 	* weapon/mace/mace_1.rtro.111.png: Fix incorrect transparency conversion from initial setup.

TODO.rtro

@@ -20,10 +20,6 @@ Images missing faces in the retro tileset:
 ./system/quests/quest_scorn_hero.111
 ./system/blocked_white.111
 ./system/blocked_magenta.111
-./system/knowledge/knowledge_messages.111
-./system/knowledge/knowledge_generic.111
-./system/knowledge/knowledge_recipes.111
-./system/knowledge/knowledge_monsters.111
 ./system/blocked_lime.111
 ./system/blocked_darkmagenta.111
 ./system/event_death.111