register forcefield and wall node as stealthnode if available

.luacheckrc

@@ -22,5 +22,6 @@ read_globals = {
 	"minetest",
 	"mesecon",
 	"unifieddyes",
-	"letters"
+	"letters",
+	"stealthnode"
 }

init.lua

@@ -37,3 +37,8 @@ if minetest.get_modpath("letters") then
 	-- register letter nodes
 	dofile(MP.."/letters.lua")
 end
+
+if minetest.get_modpath("mesecons_stealthnode") then
+	-- register stealthnodes
+	dofile(MP.."/stealthnodes.lua")
+end

mod.conf

@@ -13,4 +13,5 @@ basic_materials,
 dye,
 unifieddyes,
 letters
+mesecons_stealthnode
 """

stealthnodes.lua

@@ -0,0 +1,3 @@
+
+stealthnode.register_stealthnode("scifi_nodes", "forcefield")
+stealthnode.register_stealthnode("scifi_nodes", "wall")