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Fix bugs with duplicate fallback fonts.

Cleaned up the system font and fallback font list
memory management using smart arrays.

Cleaned up the addition and removal of font records from
the font family lists.  Previously, list insertion was occurring
when the typeface was constructed, which obscured much of the logic.

Bug #6406249 SystemUI crashed when changing Locale

Change-Id: I3e33f7868f1b0a6835b91652652a457799d991d5