This patch moves existing scanning functionality to plugin level. It does
not add anything new, just refactors the existing functionality.
AMOS BEGIN
MOV [clamemailsubject,core],[emailsubject,antivirus]
MOV [clamfailed,core],[clamfailed,antivirus_clamav]
MOV [clamlost,core],[invalidpathtoclam,antivirus_clamav]
MOV [clamunknownerror,core],[unknownerror,antivirus_clamav]
MOV [virusfounduser,core],[virusfounduser,antivirus]
AMOS END
This also removes runclamonupload config setting. It is implied that files
will be scanned if plugin is enabled, no need to have a separate setting.
In addition to that, some language strings are updated. It is 'ClamAV', not
'clam AV' (see http://www.clamav.net/index.html).