ClamWin 0.93

Notes:
1. Scanning speed improvements and significant changes in ClamAV engine
2. ClamAV team fixed a security vulnerability
2. More intelligent database updates with online status checking
3. Improved archived files handling

Changes:
- updated clamav to 0.93
- changed "Archives" settings page to "Limits"
- added IsOnline checks before database download and online version check