Update database and helper functionality in CodeIgniter

Revised database drivers, query builder, and file/inflector helpers for improved consistency and functionality. Updated copyrights, links, and standardized function names including deprecating `is_countable` in favor of `word_is_countable`. Added support for new SQL features and optimized query handling.

public/index.php

@@ -8,7 +8,7 @@
 include_once('../vendor/autoload.php');
 
 //$dotenv = new Dotenv\Dotenv(__DIR__);
-$dotenv = new Dotenv\Dotenv('../');
+$dotenv = $dotenv = Dotenv\Dotenv::createImmutable('../');
 $dotenv->load();
 
 $dotenv->required(['DB_HOST', 'DB_NAME', 'DB_USER', 'DB_PASS', 'ENVIRONMENT']);
@@ -78,7 +78,7 @@ $dotenv->required(['DB_HOST', 'DB_NAME', 'DB_USER', 'DB_PASS', 'ENVIRONMENT']);
  * Different environments will require different levels of error reporting.
  * By default development will show errors but testing and live will hide them.
  */
-switch (ENVIRONMENT)
+switch ($_ENV['ENVIRONMENT'])
 {
 	case 'development':
 		error_reporting(-1);