FrameGenerator should provide access to other FrameCutter parameters

[jmarcosfer]

What is the issue about?

• [ ] Bug
• [x] Feature request
• [ ] Usage question
• [ ] Documentation
• [ ] Contributing / Development

What part(s) of Essentia.js is involved?

• [x] essentia.js-core (vanilla algorithms)
• [ ] essentia.js-model (machine learning algorithms)
• [ ] essentia.js-plot (plotting utility module)
• [ ] essentia.js-extractor (typical algorithm combinations utility)

Description

FrameGenerator algorithm should provide parameters "lastFrameToEndOfFile", "startFromZero" and "validFrameThresholdRatio" to be passed to FrameCutter internally, as upstream Essentia library does.

Proposed solution

• This is easy to change in existing C++ wrapper, here and here.