Some more refactoring for custom streams.

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Introducing custom streams that gets input from an arbitrary data source or writes output to an arbitrary data sink

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https://github.com/ImageMagick/ImageMagick/issues/366
https://github.com/ImageMagick/ImageMagick/issues/367

https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=31314

https://github.com/ImageMagick/ImageMagick/issues/368

Use lime instead of green to avoid rounding issues (fixes #363).

Fix use of MagickRealType.

Use cl_float4 instead of own FloatPixelPacket.

Changed check for when the user_info can be used and reverted other fix.

Removed assert for the writer.

Added check for when SetImageInfo changed the blob to a file.

Set user_info to null when the file is set.

Fixed setting eof.

Changed handler into a separate reader and writer (the TIFF writer reads while it is being written).

Removed invalid set of adjoin.

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Corrected initialization when reading/writing a user blob.

coders/png.c: Update zxIf support to latest (2017-0128) proposal.  Go back

to one-pass decoding of the compressed data.

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https://github.com/ImageMagick/ImageMagick/issues/363

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Removed unused variable.

Added check for status, fixed uninitialized value and removed unused variable.

Fix CoderDecoderSeekableNonsense again.  Fix Coverity "Dead code" issue.

  * coders/png.c: Added support for a proposed new PNG chunk

    (zxIf, read-only) that is currently being discussed on the
    png-mng-misc at lists.sourceforge.net mailing list.  Enable
    exIf and zxIf with CPPFLAGS="-DexIf_SUPPORTED -DxzIf_SUPPORTED".
    If exIf is enabled, only the uncompressed exIF chunk will be
    written and the hex-encoded zTXt chunk containing the raw Exif
    profile won't be written.

Support policy rights of "All"

Added new method that can be used to write an image with a user specified blob write delegate.

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https://github.com/ImageMagick/ImageMagick/issues/362

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Fixed loop of doom.

https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=30887

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https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=31282&p=142063

https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=31284

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Merge branch 'master' of http://git.imagemagick.org/repos/ImageMagick

Undo bad commit to coders/png.c

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Folded long lines in coders/png.c

Fix finite percision problem when computing CCL mean color

Restore "Decoder" part of CoderDecoderSeekableStreamFlag

coders/png.c: Added support for a proposed new PNG chunk (exIf
read-write, eXIf read-only) that is currently being discussed on the
png-mng-misc at lists.sourceforge.net mailing list.

Update ChangeLog about eXIF support in the png codec.

Added the function definition to the deprecate.h to prevent false ABI/API warnings.

Revert change.

* Renamed read_vpag_chunk_callback() function to png_user_chunk_callback()
  in coders/png.c
* Implemented a private PNG caNv (canvas) chunk for remembering the
  original dimensions and offsets when an image is cropped.  Previously
  we used the oFFs and vpAg chunks for this purpose, but this had potential
  conflicts with other applications that also use the oFFs chunk.

Removed unused function definition.

Removed duplicate include.

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Added missing include.

Replaced CoderSeekableStreamFlag with CoderDecoderSeekableStreamFlag and CoderEncoderSeekableStreamFlag.

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https://www.imagemagick.org/discourse-server/viewtopic.php?f=1&t=31265

https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=31262

https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=31262

https://github.com/ImageMagick/ImageMagick/pull/359

https://github.com/ImageMagick/ImageMagick/pull/358

https://github.com/ImageMagick/ImageMagick/pull/358

https://github.com/ImageMagick/ImageMagick/pull/358

http://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=31210

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https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=31249

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Added support for RGB555, RGB565, ARGB4444 and ARGB1555 to the BMP encoder (Fixes #344)

https://github.com/ImageMagick/ImageMagick/issues/351

https://github.com/ImageMagick/ImageMagick/issues/355

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Use linear scaling for the number of threads.

https://github.com/ImageMagick/ImageMagick/issues/354