Lint infrastructure fixes

This changeset makes a number of infrastructure fixes to lint. It also
has some user visible aspects:

(1) The "run lint on export" option, which aborts Export APK if fatal
    errors are found, now only checks for fatal issues, which should
    be significantly faster (since it skips expensive detectors like
    the unused resource detector).

(2) The command line lint tool lets you specify not just issue ids,
    but categories to enable or disable as well.  In addition to the
    --enable and --disable flags to add or remove checks, there is
    also a --check flag which runs the exact specified checks. Thus
    you can for example run "lint --check Security" to run the
    security related lint checks.  When using --show to display the
    available id's, they are organized and described under category
    labels.

    I also cleaned up the categories a bit; "Layout" isn't a category
    anymore, and instead the layoutopt options are placed in other
    categories like "Performance" or "Usability".

(3) From the command line you can now also specify multiple projects
    or even search a directory for projects contained recursively
    within it.  This required a bunch of infrastructure changes to
    handle partitioning up the arguments into related projects (since
    checks have before-project and after-project hooks that need to
    run properly).

(4) On the infrastructure side the "scope" concept was changed to
    become a scope set, and a detector can declare that an issue
    requires analysis of any of {manifest, resource file, java source
    file, resource folder, ...} etc. When lint runs it determines
    which detectors are applicable (for example, for a single-file
    lint run it will ignore detectors which require a wider
    scope). And when applicable, a detector will be called for all the
    various scopes it requires.  Therefore, the unused resource
    detector, which used to have to manually scan the manifest file on
    its own, now automatically gets called as part of the manifest
    file parse, the resource file parses, and the java file scan.
    Single-file linting is still only supported for XML files.

Change-Id: I49a5e2b27f8f6da22904085089aa0c4d2eee67f6

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