Merge pull request #3514 from CHItA/ticket/13740

[ticket/13740] Refactoring installer

* CHItA/ticket/13740: (75 commits)
  [ticket/13740] Reduce number of references in nav provider
  [ticket/13740] Move handle_language_select calls to the controllers
  [ticket/13740] Fix infinite config.php check loop
  [ticket/13740] Move default data settings out of constructors
  [ticket/13740] Deduplicate container builder's checks
  [ticket/13740] Use JSON for installer config
  [ticket/13740] Fix comment
  [ticket/13740] Use language service in console application
  [ticket/13740] Fix CS in compatibilty_globals.php
  [ticket/13740] Fix message element creation in JS
  [ticket/13740] Replace more spaces with tabs
  [ticket/13740] Fix CS
  [ticket/13740] Filter basic directory change attempts in lang change
  [ticket/13740] Use tabs instead of spaces in JS file
  [ticket/13740] Add success message when install finished
  [ticket/13740] Fix $script_path in obtain_data
  [ticket/13740] Fix is_phpbb_installed() method
  [ticket/13740] Login admin when install finished
  [ticket/13740] Enhance server output buffer bypass
  [ticket/13740] Secure installer config against corrupted config data
  ...

phpBB/docs/install-config.sample.yml

@@ -0,0 +1,35 @@
+installer:
+    admin:
+        name: admin
+        password: adminadmin
+        email: admin@example.org
+
+    board:
+        lang: en
+        name: My Board
+        description: My amazing new phpBB board
+
+    database:
+        dbms: sqlite3
+        dbhost: /tmp/phpbb.sqlite3
+        dbport: ~
+        dbuser: ~
+        dbpasswd: ~
+        dbname: ~
+        table_prefix: phpbb_
+
+    email:
+        enabled: false
+        smtp_delivery : ~
+        smtp_host: ~
+        smtp_auth: ~
+        smtp_user: ~
+        smtp_pass: ~
+
+    server:
+        cookie_secure: false
+        server_protocol: http://
+        force_server_vars: false
+        server_name: localhost
+        server_port: 80
+        script_path: /