Multi-thread filters

[Cloneluke]

When applying email message filters, it should be multithreaded with configurable number of threads for lower elapsed time of applying filters, especially when running on entire folder.

[Jon]

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[richcsst]

Everything should be multithreaded.  I have six different email account, some personal, some for work.  The work email can get an average of 30000+ emails a day, and waiting on getting mail takes forever.  Even clicking for a new message is tearfully slow.  Seriously, the program will freeze when processing one account/folder at a time for retrieval and filters.

Computers, even so-called cheap ones have at least 4 or more cores now days.  The time of single tasking Windows 3 are over.