Replace spaces with tabs for Lua, and more (#399)

Convert code indents to tabs to be consistent with the rest of the
JavaScript code.  This commits covers all of the lua code, some of the
hand written JSON code and the lone HTML and CSS files that were not
using tabs.

plugins/statistics_exporter/module/export.lua

@@ -1,34 +1,34 @@
 local statistics = {
-    "item_production_statistics",
-    "fluid_production_statistics",
-    "kill_count_statistics",
-    "entity_build_count_statistics",
+	"item_production_statistics",
+	"fluid_production_statistics",
+	"kill_count_statistics",
+	"entity_build_count_statistics",
 }
 
 statistics_exporter = {}
 function statistics_exporter.export()
-    local stats = {
-        game_tick = game.tick,
-        player_count = #game.connected_players,
-        game_flow_statistics = {
-            pollution_statistics = {
-                input = game.pollution_statistics.input_counts,
-                output = game.pollution_statistics.output_counts,
-            },
-        },
-        force_flow_statistics = {}
-    }
-    for _, force in pairs(game.forces) do
-        local flow_statistics = {}
-        for _, statName in pairs(statistics) do
-            flow_statistics[statName] = {
-                input = force[statName].input_counts,
-                output = force[statName].output_counts,
-            }
-        end
-        stats.force_flow_statistics[force.name] = flow_statistics
-    end
+	local stats = {
+		game_tick = game.tick,
+		player_count = #game.connected_players,
+		game_flow_statistics = {
+			pollution_statistics = {
+				input = game.pollution_statistics.input_counts,
+				output = game.pollution_statistics.output_counts,
+			},
+		},
+		force_flow_statistics = {}
+	}
+	for _, force in pairs(game.forces) do
+		local flow_statistics = {}
+		for _, statName in pairs(statistics) do
+			flow_statistics[statName] = {
+				input = force[statName].input_counts,
+				output = force[statName].output_counts,
+			}
+		end
+		stats.force_flow_statistics[force.name] = flow_statistics
+	end
 
 
-    rcon.print(game.table_to_json(stats))
+	rcon.print(game.table_to_json(stats))
 end