Remove server codename

This has long been a waste of time and creativity, and that's only going to continue to be the case now that we're going to be properly versioning. New codenames every couple of months is not worth the bother.

src/pocketmine/PocketMine.php

@@ -81,7 +81,6 @@ namespace pocketmine {
 	const NAME = "PocketMine-MP";
 	const VERSION = "1.7dev";
 	const API_VERSION = "3.0.0";
-	const CODENAME = "[REDACTED]";
 
 	const MIN_PHP_VERSION = "7.2.0";
 

src/pocketmine/Server.php

@@ -309,13 +309,6 @@ class Server{
 		return \pocketmine\VERSION;
 	}
 
-	/**
-	 * @return string
-	 */
-	public function getCodename() : string{
-		return \pocketmine\CODENAME;
-	}
-
 	/**
 	 * @return string
 	 */
@@ -1611,7 +1604,6 @@ class Server{
 			$this->logger->info($this->getLanguage()->translateString("pocketmine.server.info", [
 				$this->getName(),
 				($version->isDev() ? TextFormat::YELLOW : "") . $version->get(true) . TextFormat::RESET,
-				$this->getCodename(),
 				$this->getApiVersion()
 			]));
 			$this->logger->info($this->getLanguage()->translateString("pocketmine.server.license", [$this->getName()]));

src/pocketmine/command/defaults/VersionCommand.php

@@ -50,7 +50,6 @@ class VersionCommand extends VanillaCommand{
 			$sender->sendMessage(new TranslationContainer("pocketmine.server.info.extended", [
 				$sender->getServer()->getName(),
 				$sender->getServer()->getPocketMineVersion(),
-				$sender->getServer()->getCodename(),
 				$sender->getServer()->getApiVersion(),
 				$sender->getServer()->getVersion(),
 				ProtocolInfo::CURRENT_PROTOCOL