mapi32: Resolve FIXME regarding attachment lists in MAPISendMail function

[Mark Neyhart]

Extend the MAILTO: string produced by the MAPISendMail function to include an attachment list.
Because I was unable to find any standard for MAILTO regarding attachments, I constructed the
attachment list in the format specified for Mozilla command line options.

This patch has been tested against Microsoft Excel 2000, Word 2000, Excel XP, Word XP, Excel 2003
and Word 2003.

Please note that I am not a C programmer, so feel free to suggest any corrections to my code in 
those cases where I have violated standard C programming conventions.
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