Shields: Add option to disable sound effects

shields/init.lua

@@ -8,9 +8,11 @@ if minetest.global_exists("intllib") then
 		S = intllib.Getter()
 	end
 end
+
+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(name, {