added pzs-nfs force nfo first option and bot pretime plugin mysql fixes + public chan trigger

- Added an option to tell pzs-ng to force the upload of a nfo file first (sfv dirs only). No nfo, no race! Default: option is disabled.
- New related configuration options are: force_nfo_first, noforce_nfo_first_dirs
- Modified the ngBot and themes to support the announce of BAD_FILE_NFOFIRST
- Fixed PreTime bot plugin to avoid bot freeze/crashes if mysql server goes away if idling too much time.
- Added a configurable public chan trigger to Pretime bot plugin, so the users can check the pretime of a release.