Merge pull request #72661 from DeeJayLSP/backport_audio_icons

[3.x] Backport AudioStream icons from 4.0

editor/icons/icon_audio_stream.svg

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editor/icons/icon_audio_stream_generator.svg

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+<svg height="16" viewBox="0 0 16 16" width="16" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><linearGradient id="a" gradientUnits="userSpaceOnUse" x1="8" x2="8" y1="1" y2="15"><stop offset="0" stop-color="#ff7a7a"/><stop offset=".5" stop-color="#e1dc7a"/><stop offset="1" stop-color="#66ff9e"/></linearGradient><path d="m14 9-3 5-3-12-3 7-3-2" fill="none" stroke="url(#a)" stroke-linecap="round" stroke-linejoin="round" stroke-width="2"/></svg>

editor/icons/icon_audio_stream_microphone.svg

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editor/icons/icon_audio_stream_random_pitch.svg

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