readme, convert factorio objects to tables, other refactors

README.md

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+1. output events from Factorio into Kafka.
+    1. Factorio mod listens to events.
+    2. For each event, it emits a file.
+    3. A Kafka Connector consumes each file.
+2. Factorio Web Map reads data from Kafka
+    1. converts data to images
+    2. hosts a web map
+
+todo
+
+* add settings
+  * is active - whether files are exported or not
+  * delete files - clean up all files
+  * tick-rate - how often reports are generated (
+    * requires on some sort of in-mod cache of map<entity-id, event>)
+    * also divide by game-speed? to keep ratio the same
+
+to investigate:
+
+* https://github.com/starwing/lua-protobuf
+* https://github.com/grafi-tt/lunajson
+