Minor changes

Moved config into $GLOBALS
Moved request_uri into $GLOBALS
Modified all files accordingly
Modified logout page for future improvements (not deleting the entire $_SESSION)
Fixed LICENSEs, moved LICENSE for PHP files in /lib/php subfolder instead of /lib

lib/php/classes/Database.php

@@ -5,7 +5,7 @@
         private $statement;
 
         public function __construct ( $config ) {
-            if ( $config ) {
+            if ( $config && $config [ 'host' ] && $config [ 'username' ] && $config [ 'password' ] && $config [ 'name' ] && $config [ 'port' ] ) {
                 $this->config = $config;
             }
             else {
@@ -41,4 +41,4 @@
         public function get_result ( ) : MySQLi_result {
             return $this->statement->get_result ( );
         }
-    }
+    }