clang-tidy: fix issues

src/account.cpp

src/account.h

src/archiver.cpp

src/archiver.h

src/manager.cpp

src/media/media_codec.cpp

src/media/media_codec.h

src/media/media_encoder.cpp

src/media/system_codec_container.cpp

src/media/system_codec_container.h

src/media/video/video_rtp_session.cpp

src/media/video/video_sender.cpp

src/ringdht/ringaccount.cpp

src/ringdht/ringaccount.h

src/sip/sdp.cpp

src/sip/sipaccount.cpp

src/threadloop.cpp

src/threadloop.h