[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
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