Soundswallower

What's Changed
* Merge new features from PocketSphinx 5 (and simplify things) by dhdaines in https://github.com/ReadAlongs/SoundSwallower/pull/27
* docs: update javascript docs by dhdaines in https://github.com/ReadAlongs/SoundSwallower/pull/28
* Correct pointer aliasing in SWAP_FLOAT32 by dhdaines in https://github.com/ReadAlongs/SoundSwallower/pull/29
* Final 0.4.0 release updates by dhdaines in https://github.com/ReadAlongs/SoundSwallower/pull/30


**Full Changelog**: https://github.com/ReadAlongs/SoundSwallower/compare/v0.3.2...v0.4.0

Oops, ps_add_dict() was really quite broken.

This also fixes the TypeScript declarations so as to work properly with tsc --strict.

This release fixes some small (or severe, depending on your point of view) problems:

- Big-endian platforms were broken, oops!
- It wasn't possible to mix int16 and float32 input data, not that you would really want to do that.
- Various tests didn't actually work
- It turns out -remove_noise was actually useful, so it has been brought back from the dead.

Use of standard I/O is not so much removed as made non-essential. This means that the JavaScript version no longer needs the huge and clunky Emscripten FS library, and thus is quite a bit smaller (down to 200k or so of WASM and 42k of JavaScript). We also load everything with memory-mapped I/O in C or Python, which is slightly faster.

There is a -cionly option which can make alignment a lot faster and not really less accurate.

Various issues have been fixed. The API is still not stable though.

This release adds compatibility with all (I hope) of the publicly released CMUSphinx models from https://sourceforge.net/projects/cmusphinx/files/Acoustic%20and%20Language%20Models/.

The decode_file method has been fixed to work properly when the sample rate of the file is different from the default.

There are also a number of JavaScript updates, in particular, a major change to switch to float32 input at 44.1kHz by default, as this is the only format provided directly by the WebAudio API.

There's now a JavaScript API worthy of your attention. The demo code has been moved to https://github.com/dhdaines/soundswallower-demo, and has been updated to be all "modern" for whatever that's worth. No, it's worth something, because asynchronous JavaScript is genuinely cool. Also of note, JavaScript *defaults to float32 input* because that's What the Web Wants.

A major bug in the Python and C API was fixed which broke long utterances such as used in ReadAlongs. The documentation has also been greatly improved, go see it at https://soundswallower.readthedocs.io/

Also the default acoustic model is now the narrow-band one, so as to be more robust to whatever crappy audio you throw at it, and we include also a French model (qui marche plus ou moins au Québec, désolé).