Deprecate database management methods

In order to create a better support for database management e custom query support, we deprecate methods:

• getDatabases
• createDatabase
• deleteDatabase

and we will remove those methods in v0.9.0 and we will introduce a manager in order to support those features

$manager->addQuery("getExceptionsInMinutes", function($minutes) {
    return "SELECT * FROM errors WHERE time > now() - {$minutes}m";
});

//late in your code...
$data = $manager->getExceptionsInMinutes(10);