[GM Commands] Split GM Commands Into Separate Files (#1766)

* Split GM commands into their own files

* Code cleanup

zone/gm_commands/wpadd.cpp

@@ -0,0 +1,52 @@
+#include "../client.h"
+
+void command_wpadd(Client *c, const Seperator *sep)
+{
+	int type1   = 0, type2 = 0, pause = 0; // Defaults for a new grid
+	Mob *target = c->GetTarget();
+	if (target && target->IsNPC()) {
+		Spawn2 *s2info = target->CastToNPC()->respawn2;
+		if (s2info == nullptr) {
+			c->Message(
+				Chat::White,
+				"#wpadd Failed, you must target a valid spawn."
+			);
+			return;
+		}
+
+		if (sep->arg[1][0]) {
+			if (atoi(sep->arg[1]) >= 0) {
+				pause = atoi(sep->arg[1]);
+			}
+			else {
+				c->Message(Chat::White, "Usage: #wpadd [pause] [-h]");
+				return;
+			}
+		}
+		auto position = c->GetPosition();
+		if (strcmp("-h", sep->arg[2]) != 0) {
+			position.w = -1;
+		}
+
+		auto   zone_id  = zone->GetZoneID();
+		uint32 tmp_grid = content_db.AddWPForSpawn(c, s2info->GetID(), position, pause, type1, type2, zone_id);
+		if (tmp_grid) {
+			target->CastToNPC()->SetGrid(tmp_grid);
+		}
+
+		auto grid_id = target->CastToNPC()->GetGrid();
+		target->CastToNPC()->AssignWaypoints(grid_id);
+		c->Message(
+			Chat::White,
+			fmt::format(
+				"Waypoint added to grid {} in zone ID {}. Use #wpinfo to see waypoints for this NPC (may need to #repop first).",
+				grid_id,
+				zone_id
+			).c_str()
+		);
+	}
+	else {
+		c->Message(Chat::White, "You must target an NPC to use this.");
+	}
+}
+