Shields: Add option to disable sound effects

shields/README.txt

@@ -7,3 +7,10 @@ Depends: 3d_armor
 
 Originally a part of 3d_armor, shields have been re-included as an optional extra.
 If you do not what shields then simply remove the shields folder from the modpack.
+
+Shields Configuration
+---------------------
+
+Override the following default settings by adding them to your minetest.conf file.
+
+shields_disable_sounds = false

shields/init.lua

@@ -1,9 +1,10 @@
 -- support for i18n
 local S = armor_i18n.gettext
 
+local disable_sounds = minetest.settings:get_bool("shields_disable_sounds")
 local use_moreores = minetest.get_modpath("moreores")
 local function play_sound_effect(player, name)
-	if player then
+	if not disable_sounds and player then
 		local pos = player:getpos()
 		if pos then
 			minetest.sound_play({