AGG update and possible breakage

[thomas bonfort]

hi devs
AGG rendering is now mostly complete, including font rendering.
the agg source distribution includes a freetype font manager that is not
built by default and not included in the main source/include directories,
but in the font_freetype subdir. For font rendering to work, I've pulled
agg_font_freetype.cpp and .h into the mapserver directory, as there are high
chances that distribution releases of AGG will not include the
agg_font_freetype.o in their libagg or agg_font_freetype.h in their headers.
After discussing this with frank, due to the non negligeable risks of
breaking things, I'll be waiting for your feedback/comments/etc.. on this
before commiting all this.

thomas
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