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- rename belle_tls_verify_policy into belle_tls_crypto_config (but backward compatibility ok)
- add macro to get compile warnings on deprecated functions usage
- add possibility to give the ssl_configuration structure to the crypto library
   (works with mbedtls 2.2.1 or above only)

utils.h: use inlined function instead of macro for belle_sip_logv to avoid tautological compilation error with clang

Add belle_sip_body_handler_remove_header_from_ptr() and belle_sip_memory_handler_set_buffer() functions.

This reverts commit d90ee741.

Revert " add support for header Accept"
This reverts commit fbb27d34 and 895578bb

http-provider: add belle_http_provider_set_recv_error similar to belle_sip_provider_set_recv_error for test purposes