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(cherry picked from commit a96d9585)

Fix several invalid reads in tester, and potential crash and use of unitialized value in http proxy support.

Refused uri with "@" but no username

fix(dialog): use type belle_sip_header_require_t instead common type of headers in function belle_sip_dialog_process_response_100rel

final 100rel commit. belle_sip_dialog_tester work with test 'Simple call with prack' for testing PRACK message.

Fix interoperability issue with servers send auth challenge with algorithm=md5 instead of algorithm=MD5 .
The SIP ABNF grammar says it should be written MD5 (not md5), however the matching of string must be made case-insensitive. This is a general rule with ABNF grammars.

Fix test that was not passing when executed within the test suite, and move default domain to new fs-test.linphone.org machine.

fix(belle-sip): disable new gcc 8 -Wcast-function-type warnings (FIXME in the future) + use correct copyright headers... (Not a mixed tab/spaces format!)