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I.E just a /

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

implement escaped form of username: ref 0000577: username in both URI/SDP must be automatically escaped

Only parsing tests are sucessful.

fix refresher

belle_sip_provider_add_authorization

This reverts commit 9b1e2147eeba9efbe594e8853f45630e13f8333b.