[Commands] Add #setendurance Command. (#1841)

- Add #setendurance [Endurance] command to set an NPC or player's endurance to a specified amount, or to max if the amount is greater than their max.
- Cleanup #endurance command message and logic.

zone/gm_commands/setendurance.cpp

@@ -0,0 +1,62 @@
+#include "../client.h"
+
+void command_setendurance(Client *c, const Seperator *sep)
+{
+	int arguments = sep->argnum;
+	if (!arguments || !sep->IsNumber(1)) {
+		c->Message(Chat::White, "Usage: #setendurance [Endurance]");
+		return;
+	}
+
+	auto endurance = static_cast<int>(std::min(std::stoll(sep->arg[1]), (long long) 2000000000));
+	bool set_to_max = false;
+	Mob* target = c;
+	if (c->GetTarget()) {
+		target = c->GetTarget();
+	}
+	
+	if (target->IsClient()) {
+		if (endurance >= target->CastToClient()->GetMaxEndurance()) {
+			endurance = target->CastToClient()->GetMaxEndurance();
+			set_to_max = true;
+		}
+
+		target->CastToClient()->SetEndurance(endurance);
+	} else {
+		if (endurance >= target->GetMaxEndurance()) {
+			endurance = target->GetMaxEndurance();
+			set_to_max = true;
+		}
+
+		target->SetEndurance(endurance);
+	}
+
+	c->Message(
+		Chat::White,
+		fmt::format(
+			"Set {} to {} Endurance{}.",
+			(
+				c == target ?
+				"yourself" :
+				fmt::format(
+					"{} ({})",
+					target->GetCleanName(),
+					target->GetID()
+				)
+			),
+			(
+				set_to_max ?
+				"full" :
+				std::to_string(endurance)
+			),
+			(
+				set_to_max ?
+				fmt::format(
+					" ({})",
+					endurance
+				) :
+				""
+			)
+		).c_str()
+	);
+}