Introduce tag system for further usage

machines/common.lua

@@ -17,8 +17,6 @@
 local machine={}
 local simpleElectricItemProcessor={}
 
-industrialtest.internal.simpleElectricItemProcessors={}
-
 industrialtest.internal.mclAfterDigNode=function(pos,oldmeta,lists)
 	-- Taken from https://git.minetest.land/MineClone2/MineClone2/src/branch/master/mods/ITEMS/mcl_furnaces/init.lua#L538
 	local meta=minetest.get_meta(pos)
@@ -783,5 +781,5 @@ function industrialtest.internal.registerSimpleElectricItemProcessor(config)
 			return simpleElectricItemProcessor.activeOnTimer(pos,elapsed,meta,inv,config)
 		end
 	})
-	table.insert(industrialtest.internal.simpleElectricItemProcessors,"industrialtest:"..config.name)
+	industrialtest.api.addTag("industrialtest:"..config.name,"simpleElectricItemProcessor")
 end