Tools: Remove internationalization tools (also known as `makepot.php`).

It has been a great pleasure to work with `makepot.php` over the past [https://i18n.trac.wordpress.org/changeset/4169/ 11 years] but now it's time to say goodbye.
The tools have been integrated into WP-CLI as [https://developer.wordpress.org/cli/commands/i18n/make-pot/ wp i18n make-pot] and [https://developer.wordpress.org/cli/commands/i18n/make-json/ wp i18n make-json]. The new commands were optimized to support current PHP versions and are more flexible and reliable when extracting strings for PHP, and JavaScript.

Access to the old tools continue to exist in previous branches or at https://i18n.svn.wordpress.org/tools/.

Fixes #45287.
Built from https://develop.svn.wordpress.org/trunk@45686


git-svn-id: http://core.svn.wordpress.org/trunk@45497 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-45685';
+$wp_version = '5.3-alpha-45686';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.