More settings cleanup

* While parsing the packages.xml file, don't call getPackagesLPw(); we'll
  never find a package unless something has gone horribly wrong. Instead,
  build the PackageSetting like a sane person and add it to internal
  structures.
* Add methods to create a proper copy of the PackageSetting object and
  not just the data from one class in the middle of the hierarchy.
* Stop converting Sets into Lists back into Sets when creating
  IntentFilterVerificationInfo objects
* Remove the name argument when adding a package setting; it should always
  be the name in the package setting

Bug: 30219944
Change-Id: I7fa2c540621fb5d70a59b15919bfd31d8465e25d