Footstep sounds: 5 new sounds

Original recording by Ryding.
http://freesound.org/people/Ryding/
Found by Anth0rx, edited by paramat.

Add and use 'default.node_sound_snow_defaults()' function.

mods/default/license.txt

@@ -176,3 +176,40 @@ rights may limit how you use the material.
 
 For more details:
 http://creativecommons.org/licenses/by/3.0/
+
+-----------------------
+
+CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
+Iwan Gabovitch
+Ottomaani138
+Ogrebane
+blukotek
+Sevin7
+Yoyodaman234
+Ryding
+
+No Copyright
+
+The person who associated a work with this deed has dedicated the work to the
+public domain by waiving all of his or her rights to the work worldwide under
+copyright law, including all related and neighboring rights, to the extent
+allowed by law.
+
+You can copy, modify, distribute and perform the work, even for commercial
+purposes, all without asking permission. See Other Information below.
+
+Other Information:
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+In no way are the patent or trademark rights of any person affected by CC0, nor
+are the rights that other persons may have in the work or in how the work is
+used, such as publicity or privacy rights.
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+Unless expressly stated otherwise, the person who associated a work with this
+deed makes no warranties about the work, and disclaims liability for all uses
+of the work, to the fullest extent permitted by applicable law.
+
+When using or citing the work, you should not imply endorsement by the author
+or the affirmer.
+
+For more details:
+https://creativecommons.org/publicdomain/zero/1.0/