Switch to using Symfony Flex; more rewriting to use dependency injection

Follow-up to 49d96d7

Other changes:
* Removes .env.dist and instead uses .env and .env.*.local
* Remove remaining remnants of abandoned RfX tools
* Remove usage of the service container in all classes except
  Controllers and test classes.
* Move to using default conifg parmas in services.yaml.
* More language changes, blacklist -> denylist
* More deprecations fixed, and new ones introduced!

A follow-up commit will complete the migration to Symfony 5 and fix all
other deprecations.

Bug: T331939

.gitignore

@@ -1,8 +1,7 @@
 /config/table_map.yml
 /config/parameters.yml
-/config/request_blacklist.yml
+/config/request_denylist.yml
 /build/
-/phpunit.xml
 /var/*
 !/var/cache
 /var/cache/*
@@ -13,10 +12,11 @@
 !/var/sessions
 /var/sessions/*
 !var/sessions/.gitkeep
-/node_modules/
 
 ###> symfony/framework-bundle ###
-/.env
+/.env.local
+/.env.local.php
+/.env.*.local
 /public/bundles/
 /var/
 /vendor/
@@ -30,4 +30,21 @@ i18n_helper.js
 phpDocumentor.phar
 coverage.xml
 .web-server-pid
+
+###> squizlabs/php_codesniffer ###
+/.phpcs-cache
+/phpcs.xml
+###< squizlabs/php_codesniffer ###
+
+###> symfony/phpunit-bridge ###
+.phpunit
 .phpunit.result.cache
+/phpunit.xml
+###< symfony/phpunit-bridge ###
+
+###> symfony/webpack-encore-bundle ###
+/node_modules/
+/public/build/
+npm-debug.log
+yarn-error.log
+###< symfony/webpack-encore-bundle ###

composer.json

@@ -1,6 +1,6 @@
 {
     "name": "x-tools/xtools",
-    "description": "A suite of tools to analyze page, user and project data of MediaWiki website",
+    "description": "A suite of tools to analyze page, user and project data of MediaWiki sites",
     "license": "GPL-3.0-or-later",
     "type": "project",
     "autoload": {
@@ -18,7 +18,8 @@
             "php": "7.4"
         },
         "allow-plugins": {
-            "dealerdirect/phpcodesniffer-composer-installer": true
+            "dealerdirect/phpcodesniffer-composer-installer": true,
+            "symfony/flex": true
         }
     },
     "require": {
@@ -27,7 +28,6 @@
         "ext-intl": "*",
         "ext-json": "*",
         "ext-PDO": "*",
-        "symfony/symfony": "^4.4",
         "twig/twig": "^3.0",
         "doctrine/orm": "^2.5",
         "doctrine/doctrine-bundle": "^2.2",
@@ -47,15 +47,19 @@
         "doctrine/common": "^3.1",
         "wikimedia/ip-utils": "^1.0",
         "symfony/mailer": "^4.4",
-        "symfony/web-profiler-bundle": "^4.4"
+        "symfony/web-profiler-bundle": "^4.4",
+        "symfony/flex": "^1.19",
+        "symfony/dotenv": "^4.4",
+        "symfony/yaml": "^4.4",
+        "symfony/security-csrf": "^4.4",
+        "symfony/css-selector": "^4.4"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.0",
         "symfony/phpunit-bridge": "^4.4",
         "squizlabs/php_codesniffer": "^3.3.0",
         "mediawiki/minus-x": "^0.3.2",
-        "symfony/web-server-bundle": "^4.4",
-        "dms/phpunit-arraysubset-asserts": "^0.4.0"
+        "dms/phpunit-arraysubset-asserts": "^0.4.0",
+        "symfony/browser-kit": "^4.4"
     },
     "scripts": {
         "test": [
@@ -66,7 +70,14 @@
         "fix": [
             "./vendor/bin/phpcbf .",
             "./vendor/bin/minus-x fix ."
-        ]
+        ],
+        "auto-scripts": {
+            "cache:clear": "symfony-cmd",
+            "assets:install %PUBLIC_DIR%": "symfony-cmd"
+        }
+    },
+    "conflict": {
+        "symfony/symfony": "*"
     },
     "extra": {
         "symfony-app-dir": "app",