Start using CLDR for some date-and-time strings and formats.

Use java.text.DateFormat where possible, since that is already using
the CLDR data for the things it supports.  Remove an unused date format
object from DatePickerDialog.

Add a new method for getting the standalone month names from applications,
although @hidden for now because it is an API change.

Pass the standalone month names down to native code in Time so that
tztime's strftime() can use them.

And then the bulk of the change: replace all the names for the months
and the days of the week, and AM and PM, and yesterday, today, and tomorrow,
with strings from CLDR.  And replace several of the date format strings
with ones derived from CLDR, but reformatted to use strftime() style
instead of SimpleDateFormat style.

All these resource changes go into new donottranslate-cldr.xml files
and are removed from strings.xml so that they aren't part of the
normal translation process and the translators don't have to bother
with them (and risk messing them up).

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