Fixed a bunch of PHP 7.4 syntax errors

- FIX: Removed pointless (and invalid) destructor in LinkedIn::__destruct()
- FIX: All files that trigger this deprecation notice in PHP 7.4:
       "Array and string offset access syntax with curly braces is deprecated"

e107_handlers/utf8/utils/unicode.php

@@ -46,7 +46,7 @@ function utf8_to_unicode($str) {
     
     for($i = 0; $i < $len; $i++) {
         
-        $in = ord($str{$i});
+        $in = ord($str[$i]);
         
         if ( $mState == 0) {