[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/quest_errors.cpp

@@ -0,0 +1,35 @@
+#include "../../client.h"
+#include "../../quest_parser_collection.h"
+
+void ShowQuestErrors(Client *c, const Seperator *sep)
+{
+	std::list<std::string> l;
+	parse->GetErrors(l);
+
+	if (!l.size()) {
+		c->Message(Chat::White, "There are no Quest errors currently.");
+		return;
+	}
+
+	c->Message(Chat::White, "Quest errors currently are as follows:");
+
+	uint32 error_count = 0;
+
+	for (const auto& e : l) {
+		if (error_count >= RuleI(World, MaximumQuestErrors)) {
+			c->Message(
+				Chat::White,
+				fmt::format(
+					"Maximum of {} error{} shown.",
+					RuleI(World, MaximumQuestErrors),
+					RuleI(World, MaximumQuestErrors) != 1 ? "s" : ""
+				).c_str()
+			);
+			break;
+		}
+
+		c->Message(Chat::White, e.c_str());
+
+		error_count++;
+	}
+}