Fixed GetLogEntries

This fixes #1 
- Removed "LogLevel", "Channel" and "Message from LogEntry(Light)
- Added "LastPos" and "FileSize" to LogEntry
- Changed how Timestamps get parsed in LogEntry
- Removed "timestamp" and "comparator" from QueryRunner, since they can't be used anymore
- Updated GetLogEntries + Documentation

If you found any Code-Style issues, let me know and I will fix it :smiley: