Prometheus - Donation and payment store

WARNING: If you are using Stripe you must update your API version in Stripe's dashboard for Stripe to work with this version of Prometheus. You can do so here: https://dashboard.stripe.com/developers

Web

1. Modernized several parts of the code (PHP 7.4 now required).
2. Stripe orders now have metadata set on them. You can search for things like product id, product type, user id and user receiver id.
3. Fixed a problem in the installer where the Stripe keys would not be saved properly.
4. Updated Stripe to the latest API version
5. Fixed styling and text issues on the custom job creation page.
6. Removed all usages of `get_magic_quotes_gpc`

Modified files

Web

1. vendor/*
2. inc/classes/actions.class.php
3. inc/classes/customjob.class.php
4. inc/classes/stripe.class.php
5. inc/classes/steamLogin.class.php
6. pages/store/customjob.php
7. inc/functions.php
8. stripe.php
9. ipnlistener.php
10. a bunch more files, but they are not required