[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/variable.cpp

@@ -0,0 +1,33 @@
+#include "../../client.h"
+
+void ShowVariable(Client *c, const Seperator *sep)
+{
+	const auto arguments = sep->argnum;
+	if (arguments < 2) {
+		c->Message(Chat::White, "Usage: #show variable [Variable Name]");
+		return;
+	}
+
+	const std::string& variable = sep->argplus[2];
+
+	std::string value;
+	if (!database.GetVariable(variable, value)) {
+		c->Message(
+			Chat::White,
+			fmt::format(
+				"Variable '{}' was not found.",
+				variable
+			).c_str()
+		);
+		return;
+	}
+
+	c->Message(
+		Chat::White,
+		fmt::format(
+			"Variable {} | {}",
+			variable,
+			value
+		).c_str()
+	);
+}