Remove echo plugin code and documentation. Fixes: QTBUG-119981 Change-Id: I4083ac6cdb768facaed041241af2c5ee6e28df50 Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io> (cherry picked from commit 01bf423d67d5e6f8de5ec51a6b85178492681ca9) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
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