WinGui:

WinGui:
- Activity log window code changed significantly. Now, instead of refeshing the whole log every 5 seconds, it only adds the new lines of log output.
- Fixed bugs where the autoUpdate thread could keep running after the windows had been closed, causing exceptions to occur.
- Removed some debug code from frmMain

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@1562 b64f7644-9d1e-0410-96f1-a4d463321fa5