Updated MSVC project files

[Julian Priestley]

I've updated the old ioquake3 MSVC project files (from revision 1160)
to work with the latest revision, and raised bug 3390 for this change.
I'm happy to maintain these project files if this is seen as an issue.

The patch attached to the bug also fixes an issue where Export_BotLibSetup
only allows MAX_QPATH chars for the home directory, rather than MAX_OSPATH.