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

* Split GM commands into their own files

* Code cleanup

zone/gm_commands/castspell.cpp

@@ -0,0 +1,77 @@
+#include "../client.h"
+
+void command_castspell(Client *c, const Seperator *sep)
+{
+	if (SPDAT_RECORDS <= 0) {
+		c->Message(Chat::White, "Spells not loaded.");
+		return;
+	}
+
+	Mob *target = c;
+	if (c->GetTarget()) {
+		target = c->GetTarget();
+	}
+
+	if (!sep->IsNumber(1)) {
+		c->Message(
+			Chat::White,
+			"Usage: #castspell [Spell ID]  [Instant (0 = False, 1 = True, Default is 1 if Unused)]"
+		);
+	}
+	else {
+		uint16 spell_id = std::stoul(sep->arg[1]);
+
+		if (CastRestrictedSpell(spell_id) && c->Admin() < commandCastSpecials) {
+			c->Message(Chat::Red, "Unable to cast spell.");
+		}
+		else if (spell_id >= SPDAT_RECORDS) {
+			c->Message(Chat::White, "Invalid Spell ID.");
+		}
+		else {
+			bool instant_cast = (c->Admin() >= commandInstacast ? true : false);
+			if (instant_cast && sep->IsNumber(2)) {
+				instant_cast = std::stoi(sep->arg[2]) ? true : false;
+				c->Message(Chat::White, fmt::format("{}", std::stoi(sep->arg[2])).c_str());
+			}
+
+			if (c->Admin() >= commandInstacast && instant_cast) {
+				c->SpellFinished(
+					spell_id,
+					target,
+					EQ::spells::CastingSlot::Item,
+					0,
+					-1,
+					spells[spell_id].resist_difficulty
+				);
+			}
+			else {
+				c->CastSpell(spell_id, target->GetID(), EQ::spells::CastingSlot::Item, spells[spell_id].cast_time);
+			}
+
+			if (c != target) {
+				c->Message(
+					Chat::White,
+					fmt::format(
+						"Cast {} ({}) on {}{}.",
+						GetSpellName(spell_id),
+						spell_id,
+						target->GetCleanName(),
+						instant_cast ? " instantly" : ""
+					).c_str()
+				);
+			}
+			else {
+				c->Message(
+					Chat::White,
+					fmt::format(
+						"Cast {} ({}) on yourself{}.",
+						GetSpellName(spell_id),
+						spell_id,
+						instant_cast ? " instantly" : ""
+					).c_str()
+				);
+			}
+		}
+	}
+}
+