BPathFinder: Fix resolvable expression support

We need to use the package's .self symlink, since that does point to
the package's installation location. The containing directory lives in
/boot/syste

BPathFinder: Fix resolvable expression support

We need to use the package's .self symlink, since that does point to
the package's installation location. The containing directory lives in
/boot/system/package-links and would therefore always resolve to the
system installation location.

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BPathFinder: Add BPackageResolvableExpression initialization

Add a constructor and a SetTo() method with a
BPackageResolvableExpression parameter instead of a path. The path of
the package satisfyin

BPathFinder: Add BPackageResolvableExpression initialization

Add a constructor and a SetTo() method with a
BPackageResolvableExpression parameter instead of a path. The path of
the package satisfying the expression is used.

The new functionality lives in libpackage as it uses the package kit.

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