Absorb pocketmine/classloader into the core code

the only use for this class is to facilitate random runtime plugin loading, and it's not complete even for that purpose.

Since nothing but PM uses pocketmine/classloader anyway, it doesn't make sense to have it outside the core. As with LogPthreads, it's just adding more maintenance work.

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "0dc836612512d87a694945ffb87a4096",
+    "content-hash": "812a98ecf031488987b3216e785fee19",
     "packages": [
         {
             "name": "adhocore/json-comment",
@@ -464,52 +464,6 @@
             },
             "time": "2020-12-11T01:45:37+00:00"
         },
-        {
-            "name": "pocketmine/classloader",
-            "version": "dev-stable",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/pmmp/ClassLoader.git",
-                "reference": "e15c9b4d310581d2d2c9bf2794869cb940e011e1"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/pmmp/ClassLoader/zipball/e15c9b4d310581d2d2c9bf2794869cb940e011e1",
-                "reference": "e15c9b4d310581d2d2c9bf2794869cb940e011e1",
-                "shasum": ""
-            },
-            "require": {
-                "ext-pmmpthread": "^6.0",
-                "ext-reflection": "*",
-                "php": "^8.1"
-            },
-            "conflict": {
-                "pocketmine/spl": "<0.4"
-            },
-            "require-dev": {
-                "phpstan/extension-installer": "^1.0",
-                "phpstan/phpstan": "1.10.15",
-                "phpstan/phpstan-strict-rules": "^1.0",
-                "phpunit/phpunit": "^9.5"
-            },
-            "default-branch": true,
-            "type": "library",
-            "autoload": {
-                "classmap": [
-                    "./src"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "LGPL-3.0"
-            ],
-            "description": "Ad-hoc autoloading components used by PocketMine-MP",
-            "support": {
-                "issues": "https://github.com/pmmp/ClassLoader/issues",
-                "source": "https://github.com/pmmp/ClassLoader/tree/stable"
-            },
-            "time": "2023-05-19T23:39:02+00:00"
-        },
         {
             "name": "pocketmine/color",
             "version": "0.3.1",
@@ -3252,7 +3206,6 @@
     "aliases": [],
     "minimum-stability": "stable",
     "stability-flags": {
-        "pocketmine/classloader": 20,
         "pocketmine/snooze": 20
     },
     "prefer-stable": false,