4.1

This is a dumb update, if you try not to dumb, stay 4.0.7.
However, you can make a backup and update to this version
to see if you can find any bug before 4.2 release.

• Fix scan folder sec lack translate 1c2d492
• Rename pause and resume command to stop and start d4a0812
  When pause requested, this program does not reserve intermediate run state.
  And when request resume, prefetch will run from beginning,
  and run immediately (discard unfinished prefetch interval).
  You can also type resume without have to type pause first.
  Therefore, this should be called stop and start.
  
  Due to no longer provided pause and resume command,
  This change breaks forward compatible, but is not a giant feature pack.
  So version number will increase to 4.1 instead of 5.0.
• Update command interface wiki page about stop and start
  Move pause and resume to deprecated command
• Use mutex to process pause #64 4ff199c
  Maintenance update
• Fix source code with same name in different folder "multiple definition" 6fdad94
  Maintenance update
• Move thread access from main thread to other thread #65
  Maintenance update and really dumb