Support for PHP 8 (#2158)

painful 66 commits later: required PHP version bumped to 7.3, plugin updates using migrations necessary!

.github/workflows/testing.yaml

@@ -1,4 +1,4 @@
-name: CI
+name: Tests
 on:
     pull_request: null
     push:
@@ -19,9 +19,9 @@ jobs:
                 options: --health-cmd="mysqladmin ping" --health-interval=10s --health-timeout=5s --health-retries=3
         strategy:
             matrix:
-                php: ['7.2', '7.3', '7.4']
+                php: ['7.3', '7.4', '8.0']
 
-        name: Tests - PHP ${{ matrix.php }}
+        name: PHP ${{ matrix.php }}
         steps:
             -   uses: actions/checkout@v2
             -   uses: shivammathur/setup-php@v2
@@ -48,6 +48,7 @@ jobs:
                     MAILER_URL: null://localhost
             -   name: Run migrations on MySQL
                 run: |
+                    bin/console doctrine:database:drop --if-exists --force -n
                     bin/console doctrine:database:create --if-not-exists -n
                     bin/console doctrine:migrations:migrate -n
                     bin/console doctrine:migrations:migrate first -n