Various changes to the logfilter
- Don't make a new instance of the filter for every logger, but let them
all use the same one.
- Improved the splitting of the logs.
- Include Essentials nickname checking.
- Added an option in the config to completely disable or enable the
LogFilter. (Splitter and Replacer)
- Changed to a completely different way to write to the logs. The old
system supposedly could cause a total freeze of the server. I'm not sure
if this system will fix that though.