feat(world): guilds in the world: create box, character component, guild commands

The world side of guilds (docs/Guilds.md):

- TMP_GUILD_CREATE, which the client's guild create box sends to its world, goes to the chat server as GUILD_CREATE.
- The character component reads the character's guild from the database when it loads (instead of the old unused "gn"
  and "gid" charxml attributes) and takes GUILD_GET_STATUS from the chat server; a change is serialized once (the
  client redraws the name billboard every time it reads a guild name). A name waiting for moderation isn't shown.
- Slash commands (the client has none for guilds): /g and /guild (guild chat; the client's guild tab sends /g, which
  goes through the chat filter and mute like zone chat, then to the chat server as channel 10), /guildcreate (opens the
  create box with DisplayGuildCreateBox), /gkick, /grank <name> <officer|veteran|recruit>, /gleader and
  /gdisband confirm.
- The Guild Master script (LOT 3001, L_GUILD_CREATE.lua: using it opens the create box). Live never placed it; GMs
  can spawn it.

Check in game (two accounts, a client with a FeatureGating row "guilds", 1, 0, 0 in its cdclient.fdb): /guildcreate,
make a guild (the name shows under yours, the guild button appears on the status bar); invite the second character
from the guild window, accept, both lists show both; guild chat tab; /grank, /gkick, /gleader; leave from the window;
log the second character out and in (guildmate logged off/in lines).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

dGame/dComponents/CharacterComponent.h

@@ -129,6 +129,14 @@ public:
 	 */
 	bool GetPvpEnabled() const;
 
+	/**
+	 * The character's guild as other players see it (docs/Guilds.md): guildName is empty while the name waits for
+	 * moderation, and guildID 0 is no guild. Serializes again when it changed.
+	 */
+	void SetGuild(LWOOBJID guildID, const std::u16string& guildName);
+	LWOOBJID GetGuildID() const { return m_GuildID; }
+	const std::u16string& GetGuildName() const { return m_GuildName; }
+
 	/**
 	 * Returns the characters lifetime reputation
 	 * @return The lifetime reputation of this character.
@@ -449,6 +457,9 @@ private:
 	 */
 	bool m_DirtySocialInfo = false;
 
+	// Reads the character's guild from the database (on load)
+	void LoadGuild();
+
 	/**
 	 * The guild this character is in
 	 */