v7.0.0

• Add audio-buffer/util subpath — 15 pure sample operations: from, fill, mix, normalize, trim, reverse, equal, noise, remix, pad, invert, rotate, repeat, resize, removeDC
• Add audio-buffer/play subpath — playback helper
• Add subpath exports (., ./util, ./play)
• Add slice, concat, set instance methods
• Add fromArray, like, filledWithVal static factories
• Absorbs audio-buffer-utils, audio-buffer-from, audio-buffer-remix, audio-play
• Move tests to test directory

Full Changelog: v6.0.1...v7.0.0