[Bug Fix] Fix #set faction/#setfaction Command (#3575)

# Notes
- This was an oversight on my part in `#set` command consolidation.

zone/gm_commands/set.cpp

@@ -13,6 +13,7 @@
 #include "set/endurance.cpp"
 #include "set/endurance_full.cpp"
 #include "set/exp.cpp"
+#include "set/faction.cpp"
 #include "set/flymode.cpp"
 #include "set/frozen.cpp"
 #include "set/gender.cpp"
@@ -79,6 +80,7 @@ void command_set(Client *c, const Seperator *sep)
 		Cmd{.cmd = "endurance", .u = "endurance [Amount]", .fn = SetEndurance, .a = {"#setendurance"}},
 		Cmd{.cmd = "endurance_full", .u = "endurance_full", .fn = SetEnduranceFull, .a = {"#endurance"}},
 		Cmd{.cmd = "exp", .u = "exp [aa|exp] [Amount]", .fn = SetEXP, .a = {"#setxp"}},
+		Cmd{.cmd = "faction", .u = "faction [Faction ID]", .fn = SetFaction, .a = {"#setfaction"}},
 		Cmd{.cmd = "flymode", .u = "flymode [Flymode ID]", .fn = SetFlymode, .a = {"#flymode"}},
 		Cmd{.cmd = "frozen", .u = "frozen [on|off]", .fn = SetFrozen, .a = {"#freeze", "#unfreeze"}},
 		Cmd{.cmd = "gender", .u = "gender [Gender ID]", .fn = SetGender, .a = {"#gender"}},

zone/gm_commands/set/faction.cpp

@@ -0,0 +1,54 @@
+#include "../../client.h"
+
+void SetFaction(Client *c, const Seperator *sep)
+{
+	const auto arguments = sep->argnum;
+	if (arguments < 2 || !sep->IsNumber(2)) {
+		c->Message(Chat::White, "Usage: #set faction [Faction ID]");
+		return;
+	}
+
+	if (
+		!c->GetTarget() ||
+		(
+			c->GetTarget() &&
+			c->GetTarget()->IsClient()
+		)
+	) {
+		c->Message(Chat::White, "You must target an NPC to use this command.");
+		return;
+	}
+
+	NPC* t = c->GetTarget()->CastToNPC();
+
+	const uint32 npc_id     = t->GetNPCTypeID();
+	const int    faction_id = Strings::ToInt(sep->arg[2]);
+
+	const std::string& faction_name = content_db.GetFactionName(faction_id);
+
+	if (faction_name.empty()) {
+		c->Message(
+			Chat::White,
+			"Invalid Faction ID, please specify a valid Faction ID."
+		);
+		return;
+	}
+
+	c->Message(
+		Chat::White,
+		fmt::format(
+			"Faction Changed | Name: {} ({}) Faction: {} ({}).",
+			t->GetCleanName(),
+			npc_id,
+			content_db.GetFactionName(faction_id),
+			faction_id
+		).c_str()
+	);
+
+	const std::string &query = fmt::format(
+		"UPDATE npc_types SET npc_faction_id = {} WHERE id = {}",
+		faction_id,
+		npc_id
+	);
+	content_db.QueryDatabase(query);
+}