ctf_stats: Add ctf_stats.request_save

This functionality allows mods to request a save (not immediate) if they modify player stats.

mods/ctf/ctf_bounties/init.lua

@@ -91,6 +91,14 @@ ctf.register_on_killedplayer(function(victim, killer)
 		match.score = match.score + bounty_score
 		main.bounty_kills = main.bounty_kills + 1
 		match.bounty_kills = match.bounty_kills + 1
+
+		ctf_stats.request_save()
+
+		hud_score.new(killer, {
+			name = "ctf_bounty:prize",
+			color = 0x4444FF,
+			value = bounty_score
+		})
 	end
 	bountied_player = nil
 
@@ -102,11 +110,6 @@ ctf.register_on_killedplayer(function(victim, killer)
 		minetest.colorize("#fff326", " and received " .. bounty_score .. " points!")
 	minetest.log("action", minetest.strip_colors(msg))
 	minetest.chat_send_all(msg)
-	hud_score.new(killer, {
-		name = "ctf_bounty:prize",
-		color = 0x4444FF,
-		value = bounty_score
-	})
 end)
 
 minetest.register_privilege("bounty_admin")

mods/ctf/ctf_classes/medic.lua

@@ -91,6 +91,8 @@ minetest.override_item("ctf_bandages:bandage", {
 						color = "0x00FF00",
 						value = reward
 					})
+
+					ctf_stats.request_save()
 				end
 			end
 		end

mods/ctf/ctf_stats/chat.lua

@@ -161,6 +161,7 @@ minetest.register_chatcommand("reset_rankings", {
 
 		ctf_stats.players[reset_name] = nil
 		ctf_stats.player(reset_name)
+		ctf_stats.request_save()
 
 		if reset_name == name then
 			minetest.log("action", name .. " reset their rankings")
@@ -198,6 +199,8 @@ minetest.register_chatcommand("transfer_rankings", {
 		ctf_stats.players[dest] = ctf_stats.players[src]
 		ctf_stats.players[src] = nil
 
+		ctf_stats.request_save()
+
 		minetest.log("action", name .. " transferred stats of " .. src .. " to " .. dest)
 		return true, "Stats of '" .. src .. "' have been transferred to '" .. dest .. "'."
 	end

mods/ctf/ctf_stats/init.lua

@@ -110,7 +110,10 @@ local function check_if_save_needed()
 end
 minetest.after(13, check_if_save_needed)
 
-	minetest.after(13, ctf_stats.save)
+-- API function to allow other mods to request a save
+-- TODO: This should be done automatically once a proper API is in place
+function ctf_stats.request_save()
+	_needs_save = true
 end
 
 function ctf_stats.player_or_nil(name)