- BC Break: Upgraded required _PHP_ v7.1 → v7.2

- BC Break: Core _PHP_ framework + dependencies moved into `composer.json` and are no longer part of this repo
- Upgraded some 3rd party _Composer_ dependencies: `monolog/monolog`, `swiftmailer/swiftmailer`, `league/html-to-markdown`, `react/socket`, `react/promise-stream`
- Fixed a bug where `/setup` throws HTTP `5xx` error if no `pathfinder` DB exists
- Fixed compatibility issue with PHP `v7.4`, closed #887

app/main/lib/logging/handler/SocketHandler.php

@@ -31,7 +31,7 @@ class SocketHandler extends \Monolog\Handler\SocketHandler {
      * @param array $record
      * @return bool
      */
-    public function handle(array $record){
+    public function handle(array $record) : bool {
         if (!$this->isHandling($record)) {
             return false;
         }