- 'GhcPkg' now parses 'ghc-pkg -v list' output directly to also get the
package-id
- Remove unused field 'cradlePackages' in Cradle
- Remove 'getPackageDbPackages' and use 'ghcPkgListEx' instead
- cradle now stores a list of active package databases instead of only
the user store (if present).
- rename `cradlePackageDb` -> `cradlePkgDbStack` as that`s what the ghc
documentaion calls this kind of thing
- `getPackageDbPackages` now returns names of all visible packages in
the given directory. Also the implementation now uses `ghc-pkg`
instead of manually looking at the package database
