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.

application/config/database.php

@@ -75,10 +75,10 @@ $query_builder = TRUE;
 
 $db['default'] = array(
 	'dsn'	=> '',
-	'hostname' => getenv('DB_HOST'),
-	'username' => getenv('DB_USER'),
-	'password' => getenv('DB_PASS'),
-	'database' => getenv('DB_NAME'),
+	'hostname' => $_ENV['DB_HOST'],
+	'username' => $_ENV['DB_USER'],
+	'password' => $_ENV['DB_PASS'],
+	'database' => $_ENV['DB_NAME'],
 	'dbdriver' => 'mysqli',
 	'dbprefix' => '',
 	'pconnect' => FALSE,