Nether portal -> struct api, add schematics

mods/ITEMS/mcl_portals/mod.conf

@@ -1,4 +1,4 @@
 name = mcl_portals
 description = Adds buildable portals to the Nether and End dimensions.
-depends = mcl_nether, mcl_end, mcl_particles, mcl_spawn, mcl_credits
+depends = mcl_nether, mcl_end, mcl_particles, mcl_spawn, mcl_credits, mcl_structures
 optional_depends = awards, doc

mods/ITEMS/mcl_portals/portal_nether.lua

@@ -906,3 +906,18 @@ minetest.override_item(OBSIDIAN, {
 		end
 	end,
 })
+
+mcl_structures.register_structure("nether_portal",{
+	nospawn = true,
+	filenames = {
+		modpath.."/schematics/mcl_portals_nether_portal.mts"
+	},
+	after_place = function(pos,def,pr,blockseed)
+	end
+})
+mcl_structures.register_structure("nether_portal_open",{
+	nospawn = true,
+	filenames = {
+		modpath.."/schematics/mcl_portals_nether_portal_open.mts"
+	},
+})