PHP extensions and PHP INI

Add

• Show available PHP extension via --show=php-ext option (thanks to https://github.com/yogendra-revanna);
• Show PHP ini configuration via --show=php-ini (thanks to https://github.com/yogendra-revanna).

Change

• Managing default show options. Before this change the default was to show all options. Now we have a lot of option to show (also the long list of PHP extension and PHP ini configuration), so by default LaraLens shows: configuration, runtime, HTTP connection, database, migrations.