Baresip v3.4.0 (2023-08-09)

• tools: add adaptive aubuf plot generation
• webrtc: add media track sdp direction
• webrtc: remove G711 module
• cmake: fix default path in FindAMR.cmake
• cmake: FindPNG.cmake - correct else path for PNG_FOUND
• webrtc: fix format and minor improvements
• cmake: add /usr/lib{64,}/glib-2.0 to FindGST.cmake
• ci/mingw: downgrade cmake
• call: logic fix in call_modify. remove call->sent_answer = false
• cmake/modules: fix ffmpeg static linking order
• webrtc: use 640x480 resolution for both sending and receiving
• readme: update list of RFCs
• test/cmake: list source files in alphabetical order
• test: fix typo in call test
• video,stream: stop natpinhole timer on re-invite