Add IconsDir entry to config

[Vincent Béron]

Marcus patch for winemenubuilder has been commited, but for almost all
users the icons will end up in c:\windows\temp for a lack of an IconsDir
entry in config. I don't find that location suitable for long-term
storage of icons.

This is still not perfect as most new users don't use config anymore.

Changelog:
Add a "IconsDir" entry in default config and in the drive_c layout.

Vincent
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