Misc Lint Fixes

This changeset contains fixes for several unrelated reported lint
bugs:

26505: Default disabled rules that are explicitly enabled do not
       activate
26467: Lint says ByteBuffer.array is API 9+ but it's really API 1+
26501: Warning "This tag and its children can be replaced by one
       <TextView/> and a compound drawable" is not always correct
       (Partially fixed)

It also fixes the following bugs:

- The quickfix for the typography detector did not work for the
  fraction warning (replacing 1/2 with the half unicode symbol etc)
- A couple of XML detectors did not check for SuppressLint on the
  associated root node
- Add a --exitcode flag, and only set the exit code to non-zero if
  that flag is specified. Also fix the code such that non-fatal errors
  also contribute to the exit code.
- Make the HTML reporter classes public to help Maven integration.

Change-Id: I60f5fdcb2a465d51fa58bb918a195b373096d54b

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