Fix weather in dimensions + portal remove/desync handling

[typlosion14]

Weather:

• FabricWorldCreator: set RuntimeWorldConfig.setSunny(0) so clearWeatherTime starts at 0 and the vanilla weather cycle (rain/thunder) works in Multiworld dimensions. Retroactive on next server restart (issue Weather isn't working in multiworld dimensions #168).

Portals:

• Add /mw portal remove (perm multiworld.portal.remove): clears portal blocks, in-memory entry, and the portals.yml section.
• Handle desynced portals: when the destination world is not loaded, skip the teleport (no more NPE), warn the player via action bar, and log an ERROR per broken portal on server start. list/info now show sync status. + When /mw tp: "java.lang.ClassCastException: class java.lang.Integer cannot be cast to class java.lang.Long" #67
• createPortalArea: no longer builds an obsidian frame; only fills air in the selection with portal blocks, leaving the player-built frame untouched.

[typlosion14]

"createPortalArea: no longer builds an obsidian frame; only fills air in the selection with portal blocks, leaving the player-built frame untouched."
is a feature I wanted because the obsidian frame is actually not needed to keep the portal.

"Handle desynced portals: when the destination world is not loaded, skip the teleport (no more NPE), warn the player via action bar, and log an ERROR per broken portal on server start. list/info now show sync status."
Watch portal desync and avoid teleportation to nether if one desync

[typlosion14]

• Add /mw time <set|add|query> [world id]: per-dimension time of
  day control, unlike vanilla /time which sets every world at once.
  Accepts tick values and named times (day/noon/night/midnight/...) (like vanilla /time).

• Fix gamerules & difficulty leaking across dimensions: upstream Fantasy
  mirrors the overworld's GameRules/difficulty by default, so /mw gamerule
  and /mw difficulty affected every world. Disable mirroring in
  FabricWorldCreator (setMirrorOverworldGameRules/Difficulty(false)) so each
  runtime world keeps its own.

Retroactive on next server restart.

[typlosion14]

Add /mw info command + fix world-load config parse crash (Fabric 1.21.1)

• /mw info [world id]: read-only diagnostics for a dimension (present
  players, time of day, weather + clear/rain/thunder timers, gamerules
  differing from the overworld, and spawn position from /mw spawn's
  source). Targets the current dimension by default, or a named world.
• Fix StringIndexOutOfBoundsException in FileConfiguration.loadFile when a
  world config has nested/colon keys (e.g. a modded gamerule like
  accessories.keepAccessoryInventory): guard the de-indentation substring
  calls so the saved world loads instead of being skipped. #

[pisaiah]

Big thanks!