cli (call, file), frontends: implement webRTC data channel transfer: - file send/receive commands now supports webRTC transfer. In `send` command, the `--webrtc` flags is currenty used to activate it. - WebRTC related code have been factorized and moved to `libervia.frontends.tools.webrtc*` modules. rel 442

syntax: glob
bridge_constructor/generated
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ctags_links/
dist/
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libervia_backend.egg-info/
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