Update version to 0.2.1, add player color retrieval, and enhance train trip statistics

Performance improvments for power stats

power-stats.lua

@@ -1,7 +1,11 @@
 function AddPowerPole(event)
     local e = event.entity
-    if e and e.valid and e.type == "electric-pole" then
+    if e then
         storage.representativePoles[e.unit_number] = e
+        -- Update cache with new network
+        if e.electric_network_id then
+            storage.networkCache[e.electric_network_id] = e
+        end
     end
 end
 
@@ -9,31 +13,40 @@ function RemovePowerPole(event)
     local e = event.entity
     if e then
         storage.representativePoles[e.unit_number] = nil
+        -- Invalidate cache - force rebuild to find new representative if needed
+        storage.networkCache = nil
     end
 end
 
 function GetNetworks()
+    -- Return cached networks if available, otherwise rebuild
+    if storage.networkCache then
+        return storage.networkCache
+    end
+    
     local networks = {}
-
     for _, pole in pairs(storage.representativePoles) do
         if pole.valid then
-            local net = pole.electric_network_id
-            if net then
-                networks[net] = pole
+            local netID = pole.electric_network_id
+            if netID then
+                networks[netID] = pole
             end
         end
     end
-
+    
+    storage.networkCache = networks
     return networks
 end
 
 function ScanNetworks()
     storage.representativePoles = {}
+    storage.networkCache = {}
 
     for _, surface in pairs(game.surfaces) do
         for _, pole in pairs(surface.find_entities_filtered{type = "electric-pole"}) do
             if pole.valid and pole.electric_network_id then
                 storage.representativePoles[pole.unit_number] = pole
+                storage.networkCache[pole.electric_network_id] = pole
             end
         end
     end