Fix STR #2530 (Mac OS only). Implements a fast algorithm for fl_width() that memorizes the

width of all characters the first time they are seen and computes the width of a string
as the sum of the widths of its characters. Char widths are memorized in 256 blocks of 256 widths;
only blocks used in some text are allocated and computed. The width of characters beyond
U+FFFF is computed anew each time. Strings are drawn using core text, after having 
deactivated character kerning, so their width is the sum of the widths of their characters.
This is the same algorithm as used for WIN32.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@8305 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

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