tickets: allow campaign config to be changed mid campaign

Before this change the whole ticket configuration would be saved to the
state file. This made modifying the ticket configuration impossible mid
campaign which makes campaign balancing an issue. With this change only
the current ticket count and the original ticket start values are saved
to the state file. All modifiers and difficulty can be modified by
stopping the server, modifying the difficulty, and reloading the start
file.

src/dct/systems/tickets.lua

@@ -11,6 +11,8 @@ local Command  = require("dct.libs.Command")
 local Check    = require("dct.templates.checkers.Check")
 local UPDATE_TIME = 120
 
+local coa_list = {"red", "blue", "neutral"}
+
 local difficulty = {
 	["EASY"] = {
 		["player_cost"]     = 1.0,
@@ -168,7 +170,7 @@ function CheckGoals:check(data)
 
 	local checkside = CheckSide()
 
-	for _, side in pairs({"red", "blue", "neutral"}) do
+	for _, side in pairs(coa_list) do
 		ok, key, msg = checkside:check(data[side])
 
 		if not ok then
@@ -200,12 +202,9 @@ function Tickets:__init(theater)
 	end
 end
 
-function Tickets:_unmarshalpost(data)
-	for _, tbl in ipairs({"tickets"}) do
-		self[tbl] = {}
-		for k, v in pairs(data[tbl]) do
-			self[tbl][tonumber(k)] = v
-		end
+function Tickets:unmarshal(data)
+	for k, v in pairs(data.tickets) do
+		utils.mergetables(self.tickets[tonumber(k)], v)
 	end
 
 	if self.timeout then
@@ -214,9 +213,22 @@ function Tickets:_unmarshalpost(data)
 	end
 end
 
+local include_list = {
+	["start"]   = true,
+	["tickets"] = true,
+}
+
 function Tickets:marshal()
 	local data = Marshallable.marshal(self)
 
+	for _, coa in pairs(coalition.side) do
+		for key, _ in pairs(data.tickets[coa]) do
+			if include_list[key] == nil then
+				data.tickets[coa][key] = nil
+			end
+		end
+	end
+
 	if self.timeout then
 		data.timeleft = self.timer:remain()
 	end
@@ -238,7 +250,7 @@ function Tickets:readconfig()
 		self.timer = Timer(goals.time, timer.getAbsTime)
 		self.timeout = true
 	end
-	for _, val in ipairs({"red", "blue", "neutral"}) do
+	for _, val in ipairs(coa_list) do
 		local s = coalition.side[string.upper(val)]
 		self.tickets[s] = goals[val]
 		self.tickets[s].name = val