Cherry-pick most commits since 15c0376

Commits not directly related to network changes were cherry-picked
on a best-effort basis, as some cause difficult merge conflicts.

Commits skipped over:
0d1eedcccc
aa474e4501
82482ecd9d
b214cde5b4
2066655aae
7e088fdfe3
40bf1d7b5f
1b2f64473e
7e56637ed0
64ff966bae
51057a56f5
009149a073
cf4045ff0f
e357577cb2
49f84b76bc
b019221c30
7880ff74b6
146f77fdb7
a704c04f00

Commits with conflicts:
038d3a31df
e9eda2b0d0
708337dfc2 ~~ modified client.cpp manually; shadow changes to packethandlers/client.cpp
36e8ba9ce2 ~~ modified main.cpp manually; add ALLOW_ZWRITE_ON_TRANSPARENT set
3b6480c5b0 ~~ modified server.cpp manually; change wrapDegrees -> modulo360f
5a5854ea9d
c09d026f05
3c91ad8fc2

builtin/mainmenu/dlg_create_world.lua

@@ -90,6 +90,8 @@ local function create_world_buttonhandler(this, fields)
 
 			local message = nil
 
+			core.setting_set("fixed_map_seed", fields["te_seed"])
+
 			if not menudata.worldlist:uid_exists_raw(worldname) then
 				core.setting_set("mg_name",fields["dd_mapgen"])
 				message = core.create_world(worldname,gameindex)
@@ -97,8 +99,6 @@ local function create_world_buttonhandler(this, fields)
 				message = fgettext("A world named \"$1\" already exists", worldname)
 			end
 
-			core.setting_set("fixed_map_seed", fields["te_seed"])
-
 			if message ~= nil then
 				gamedata.errormessage = message
 			else