Libev / libc-ares Migration

Libev / libc-ares Migration

  - Bounce-o-matic:
   - use parsend Queue structure instead of parsing the queue message ourselves
   - only Compose the bounce message, if we're shure we'll need it
   - malloc all memory first, and fail if..
  - restructure Message Queue documentation
  - parse not yet identified Submitted-Header into queue item
  - Alloc QueueItem->StatusMessage on creation so we have it easier writing it later

  - Start implementing timeout/abort conditions

  - c-ares integration: start/stop the right event-watchers
  - c-ares integration: give it its own watcher structs