Msg_Export: Fix exporting unicode messages, make it even faster (addresses #609)

Previously code worked with opening file and loading BOM at writing each event. When we stopped closing/opening file at each event it couldn't read BOM anymore, so it wrote messages in wrong codepage.

This is not fixed by parameter defining we are just appending the file, so it doesn't need to determing BOM or even check file size. Thanks to this exporting is now about 70% faster than the initial optimization commit (in sum 13.5x faster than before).

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