We need to track different things in the server and client, so
separate things to two independent structures to keep things more
clear.

Some of these were excessively large because of redundant factors
in the size calculation.

Some encodings must be handled in the order they are received.
Make sure we respect this in the decode manager.

Allows us to add attributes later that affect of the decoder
manager deals with the decoders.

We need to split these steps up in preparation for multi-core
support. Reading needs to be done in a serial manner, whilst
decoding can be done in parallel.

This also involved a rather large cleanup of the Tight decoder.

This avoid a lot of unnecessary middle men. This also pushes the
responsibility for pixel format conversion into the encoders and
decoders. The new bufferFromBuffer() is used for direct conversion,
rather than PixelTransformer/TransImageGetter.

The connection object is a much more appropriate object for the
decoders and encoders to keep track of. Besides the streams, it also
contains state like connection parameters.

Keep the generic stream classes clean and general.

We have no use for it, so let's keep things simple.

common cases.


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