[Commands] Consolidate #show commands into a singular #show command (#3478)

* [Cleanup] Consolidate #show commands into a singular #show command

# Notes
- All `#show` commands like `#showbuffs` are now subcommands of `#show`.
- All aliases like `#showbuffs` still function.

* Push up progress.

* Final push.

* Cleanup.

* Update ip_lookup.cpp

* emotes not emote

* Cleanup

* Update servertalk.h

* Update show.cpp

* Fix

* Final push.

* #aggro

* #who

zone/gm_commands/show/xtargets.cpp

@@ -0,0 +1,40 @@
+#include "../../client.h"
+#include "../../common/data_verification.h"
+
+void ShowXTargets(Client *c, const Seperator *sep)
+{
+	auto t = c;
+	if (c->GetTarget() && c->GetTarget()->IsClient()) {
+		t = c->GetTarget()->CastToClient();
+	}
+
+	const auto arguments = sep->argnum;
+	if (arguments < 2 || !sep->IsNumber(2)) {
+		t->ShowXTargets(c);
+		return;
+	}
+
+	const auto new_max = static_cast<uint8>(Strings::ToUnsignedInt(sep->arg[2]));
+
+	if (!EQ::ValueWithin(new_max, 5, XTARGET_HARDCAP)) {
+		c->Message(
+			Chat::White,
+			fmt::format(
+				"Number of XTargets must be between 5 and {}.",
+				XTARGET_HARDCAP
+			).c_str()
+		);
+		return;
+	}
+
+	t->SetMaxXTargets(new_max);
+
+	c->Message(
+		Chat::White,
+		fmt::format(
+			"Max number of XTargets set to {} for {}.",
+			new_max,
+			c->GetTargetDescription(t)
+		).c_str()
+	);
+}