Feet update (#9344)

* Footstep sounds update

* adjustments I thought of

Resources/Audio/Effects/Footsteps/sources.txt

@@ -1,4 +1,9 @@
-Sounds in this folder taken from here: 
+Most sounds in this folder taken from here unless otherwise specified: 
 https://github.com/discordia-space/CEV-Eris/tree/04f9e57ecf8a1c89ae2cba0f6803b6c5e9887c15/sound/effects/footstep
 https://github.com/tgstation/tgstation/tree/f8ee37afc00bce1ad421615eaa0e4cbddd5eea90/sound/effects
-https://github.com/vgstation-coders/vgstation13/tree/fbe7abec4cbadf2ad01369838828704fd7ca81ea/sound/effects
+https://github.com/vgstation-coders/vgstation13/tree/fbe7abec4cbadf2ad01369838828704fd7ca81ea/sound/effects
+
+catwalk, floor, plating, tile, hull and wood sfx modified by mirrorcult.
+
+grass1.ogg and grass2.ogg are taken from https://freesound.org/people/D001447733/sounds/464609/ by D001447733 licensed under CC BY-3.0 and split by mirrorcult
+grass3.ogg and grass4.ogg are taken from https://freesound.org/people/jevans27/sounds/563529/ by jevans27 licensed under CC-0 and split/modified by mirrorcult