Use "new" API call KillMails.xml for API fetching

Includes the latest version of Salvoxia's "API KillMails Mod"
into EDK core. The old API Killlog is not used anymore.
Note:
- This was a quick include, so class names were not changed
- Full functionality of CCP KillMail API is given (no more
  caching issues)
- cron jobs now also work automatically