Replace some sounds with new sounds (#2605)

mods/default/README.txt

@@ -264,32 +264,17 @@ Glass breaking sounds (CC BY 3.0):
   3: http://www.freesound.org/people/lsprice/sounds/88808/
 
 Mito551 (sounds) (CC BY-SA 3.0):
-  default_dig_choppy.ogg
-  default_dig_cracky.ogg
-  default_dig_crumbly.1.ogg
-  default_dig_crumbly.2.ogg
+  default_dig_crumbly.*.ogg
   default_dig_dig_immediate.ogg
   default_dig_oddly_breakable_by_hand.ogg
-  default_dug_node.1.ogg
-  default_dug_node.2.ogg
+  default_dug_node.*.ogg
   default_grass_footstep.1.ogg
   default_grass_footstep.2.ogg
   default_grass_footstep.3.ogg
-  default_gravel_footstep.1.ogg
-  default_gravel_footstep.2.ogg
-  default_gravel_footstep.3.ogg
-  default_gravel_footstep.4.ogg
-  default_grass_footstep.1.ogg
-  default_place_node.1.ogg
-  default_place_node.2.ogg
-  default_place_node.3.ogg
-  default_place_node_hard.1.ogg
-  default_place_node_hard.2.ogg
-  default_hard_footstep.1.ogg
-  default_hard_footstep.2.ogg
-  default_hard_footstep.3.ogg
-  default_sand_footstep.1.ogg
-  default_sand_footstep.2.ogg
+  default_gravel_footstep.*.ogg
+  default_place_node.*.ogg
+  default_place_node_hard.*.ogg
+  default_glass_footstep.ogg
   default_wood_footstep.1.ogg
   default_wood_footstep.2.ogg
   default_dirt_footstep.1.ogg
@@ -301,8 +286,8 @@ Metal sounds:
   - https://www.freesound.org/people/yadronoff/sounds/320397/
   default_dug_metal.*.ogg - Iwan Gabovitch - qubodup - CC0
   - http://opengameart.org/users/qubodup
-  default_metal_footstep.*.ogg - Ottomaani138 - CC0
-  - https://www.freesound.org/people/Ottomaani138/sounds/232692/
+  default_metal_footstep.*.ogg - (CC0 1.0) - CC0 1.0
+  - https://freesound.org/people/mypantsfelldown/sounds/398937/
   default_place_node_metal.*.ogg - Ogrebane - CC0
   - http://opengameart.org/content/wood-and-metal-sound-effects-volume-2
 
@@ -340,6 +325,39 @@ sonictechtonic (CC BY 3.0):
 https://www.freesound.org/people/sonictechtonic/sounds/241872/
   player_damage.ogg
 
+Sheyvan (CC0 1.0):
+https://freesound.org/people/Sheyvan/sounds/476113/
+  default_dig_choppy.*.ogg
+
+lolamadeus (CC0 1.0):
+https://freesound.org/people/lolamadeus/sounds/179341/
+  default_gravel_dig.*.ogg
+  default_gravel_dug.*.ogg
+
+Benboncan (CC BY 3.0):
+https://freesound.org/people/Benboncan/sounds/71823/
+  default_dig_cracky.*.ogg
+
+Erdie (CC BY 3.0):
+https://freesound.org/people/Erdie/sounds/41579/
+  default_hard_footstep.*.ogg
+
+worthahep88 (CC0 1.0):
+https://freesound.org/people/worthahep88/sounds/319224/
+  default_sand_footstep.*.ogg
+
+dheming (CC BY 3.0):
+https://freesound.org/people/dheming/sounds/268023/
+  default_ice_dig.*.ogg
+
+InspectorJ (CC BY 3.0):
+https://freesound.org/people/InspectorJ/sounds/416967/
+  default_ice_footstep.*.ogg
+
+Angel_Perez_Grandi (CC BY 3.0):
+https://freesound.org/people/Angel_Perez_Grandi/sounds/49190/
+  default_ice_dug.ogg
+
 iankath (CC0 1.0)
 https://freesound.org/people/iankath/sounds/173991/
   default_furnace_active.ogg