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

* Split GM commands into their own files

* Code cleanup

zone/gm_commands/traindisc.cpp

@@ -0,0 +1,65 @@
+#include "../client.h"
+
+void command_traindisc(Client *c, const Seperator *sep)
+{
+	Client *target = c;
+	if (c->GetTarget() && c->GetTarget()->IsClient() && c->GetGM()) {
+		target = c->GetTarget()->CastToClient();
+	}
+
+	if (sep->argnum < 1 || !sep->IsNumber(1)) {
+		c->Message(Chat::White, "FORMAT: #traindisc <max level> <min level>");
+		return;
+	}
+
+	uint8 rule_max_level = (uint8) RuleI(Character, MaxLevel);
+	uint8 max_level      = (uint8) std::stoi(sep->arg[1]);
+	uint8 min_level      = (
+		sep->IsNumber(2) ?
+			(uint8)
+				std::stoi(sep->arg[2]) :
+			1
+	); // Default to Level 1 if there isn't a 2nd argument
+
+	if (!c->GetGM()) { // Default to Character:MaxLevel if we're not a GM and Level is higher than the max level
+		if (max_level > rule_max_level) {
+			max_level = rule_max_level;
+		}
+
+		if (min_level > rule_max_level) {
+			min_level = rule_max_level;
+		}
+	}
+
+	if (max_level < 1 || min_level < 1) {
+		c->Message(Chat::White, "ERROR: Level must be greater than or equal to 1.");
+		return;
+	}
+
+	if (min_level > max_level) {
+		c->Message(Chat::White, "ERROR: Minimum Level must be less than or equal to Maximum Level.");
+		return;
+	}
+
+	uint16 learned_disciplines = target->LearnDisciplines(min_level, max_level);
+	if (target != c) {
+		std::string discipline_message = (
+			learned_disciplines > 0 ?
+				(
+					learned_disciplines == 1 ?
+						"A new discipline" :
+						fmt::format("{} New disciplines", learned_disciplines)
+				) :
+				"No new disciplines"
+		);
+		c->Message(
+			Chat::White,
+			fmt::format(
+				"{} learned for {}.",
+				discipline_message,
+				target->GetCleanName()
+			).c_str()
+		);
+	}
+}
+