SilenceTrimmer.swift contains adaptations of gap detection, thresholds, and
fade handling from Pocket Casts AudioReadTask.swift and AudioUtils.swift,
Automattic/pocket-casts-ios revision
1fba7a266e5ae9c570299c799abbe2831e161d26.

The adapted file is distributed under the Mozilla Public License 2.0.
See MPL-2.0.txt and the source file's license header.
