Major refactoring (big thanks to OldCoder) enabling CLI and local storage and cleaner modpol/MT split

storage-mod_storage.lua

@@ -0,0 +1,26 @@
+-- ===================================================================
+-- /storage-mod_storage.lua
+-- Persistent storage via Minetest's mod_storage method
+-- See https://dev.minetest.net/StorageRef
+
+-- Loads content of stored orgs and ledger from mod_storage
+modpol.load_storage = function()
+   local mod_storage = minetest.get_mod_storage()
+   -- load orgs
+   local stored_orgs = minetest.deserialize(mod_storage:get_string("orgs"))
+   if (stored_orgs ~= nil) then
+      modpol.orgs = stored_orgs
+   end
+   -- load orgs
+   local stored_ledger = minetest.deserialize(mod_storage:get_string("ledger"))
+   if (stored_ledger ~= nil) then
+      modpol.ledger = stored_ledger
+   end
+end
+
+-- Stores content of current orgs and ledger to mod_storage
+modpol.store_data = function()
+   -- write to storage
+   mod_storage:set_string("orgs", minetest.serialize(modpol.orgs))
+   mod_storage:set_string("ledger", minetest.serialize(modpol.ledger))
+end