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Added possibility to add a user body handler inside a file body handler to dynamically edit the content of the file in both directions

Fix issue in multipart body splitting ('--' characters at the beginning of the boundary was kept in the part body).

Add belle_sip_body_handler_remove_header_from_ptr() and belle_sip_memory_handler_set_buffer() functions.

This reverts commit c5004c1d.

As always, fix compilation with Visual Studio because of variable not declared at the beginning of a block...

- reception to be implemented
- flexible boundary to be implemented
- managing part content-type to be implemented

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