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* Upgrades dlib's included libjpeg to version 8d

* Overloads load_jpeg to read from memory buffer

* Removes "__inline__" define in jconfig, broke VC build

* Changes buffer size type to size_t

This is the dlib/image_processing/generic_image.h file.  Then I changed all the
image processing functions so that they use this interface.  All the changes
are very minor, but there are just a lot of them.

Any user code that was using array2d objects to represent images will still
work.  However, this change makes it so that users can use their own custom
image objects with dlib by simply implementing a few global functions for their
image object.

I/O options dlib supports.  Also added ones which can work directly with
a string file name.

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at the top of each file.

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