Reduce hud icons size to 12x12 pixels (#2669)

mods/default/README.txt

@@ -151,7 +151,6 @@ BlockMen (CC BY-SA 3.0):
   default_chest_top.png
   default_mineral_mese.png
   default_meselamp.png
-  bubble.png
   gui_formbg.png
   gui_furnace_arrow_bg.png
   gui_furnace_arrow_fg.png
@@ -196,9 +195,6 @@ Gambit (CC BY-SA 3.0):
 asl97 (CC BY-SA 3.0):
   default_ice.png
 
-KevDoy (CC BY-SA 3.0):
-  heart.png
-
 Pithydon (CC BY-SA 3.0)
   default_coral_brown.png
   default_coral_orange.png
@@ -255,6 +251,10 @@ Extex101 (CC BY-SA 3.0)
   default_large_cactus_seedling.png
   default_dry_shrub.png -- Derived from the original texture by celeron55
 
+An0n3m0us (CC BY-SA 3.0):
+  heart.png -- Derived from a texture by KevDoy (CC BY-SA 3.0)
+  bubble.png -- Derived from a texture by BlockMen (CC BY-SA 3.0)
+
 
 Sounds
 ------

mods/default/license.txt

@@ -51,6 +51,7 @@ Copyright (C) 2010-2018:
   Mossmanikin
   random-geek
   Extex101
+  An0n3m0us
 
 You are free to:
 Share — copy and redistribute the material in any medium or format.