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Introduce an fz_overprint bitmap (currently just a uint32_t,
but it'll grow to be an array of them if FZ_MAX_COLOR is
increased). Pointers to this are passed into all our
painting routines.
NULL means "Do what you've always done before, with no overprint".
non NULL, means that every set bit means "don't ever alter this
component".
We therefore set the overprint bitmap up according to the input
color/colorspace/colorparams before calling each routine.
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Introduce FZ_PLOTTER defines to set which defines we required.
Add FZ_ENABLE define to set which document handlers are built
by default.
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fz_pixmaps now have an explicit stride value. By default no change
from before, but code all copes with extra gaps at the end of the
line.
The alpha data in fz_pixmaps is no longer compulsory.
mudraw: use rgb not rgba (ppmraw), cmyk not cmyka (pkmraw).
Update halftone code to not expect alpha plane.
Update PNG writing to cope with alpha less input.
Also hide repeated params within the png output context.
ARM code needs updating.
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Try to limit aliasing issues.
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To avoid having to duplicate a fairly large block of code several
times, use repeated inclusion of a header with some macros to
generate optimised glyph plotters.
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