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The are going to be used to implement a kind of floating ref for liblinphone C objects.

belle_sip_object.c: destroy object if ref count reaches 0 even if no pool is available for the given object (eg. in tester when no linphone core is instanciated)

optimize belle_sip_object_t (size field moved to vptr)
fix Makefile warning.

modifications of http chunked mode (receiving): each segment of data received is immediately pushed to the body, without waiting for the end of the chunk.
This makes it more tolerant to servers sending big chunks of data.

* implement retry of EWOULDBLOCK returned send()
* rework channel's listener for clarity
* fix various memory leaks.

Unit test updated for testing it.

Added a belle_sip_dict_t that has base accessors over this storage, and the appropriate unit tests.

 - Use size_t instead of unsigned int for offset.
 - Add function to enable marshal check at runtime.
 - Enable marshal check in unit tests.

 - Use our own implementation of snprintf() called belle_sip_snprintf() to handle the various native implementations whose return values are not consistent.
 - Simplify error handling in marshalling.