[Developer] Add kmlmc command line compiler and environment

[mcdurdin]

Once PR #1983 is merged, rebase this to beta.

This PR integrates kmlmc into Keyman Developer, as a command line tool. This does not include a way to build a lexical model from the GUI yet.

The majority of the work is in bundling an appropriate minimal node environment. The requirements are:

1. No new installation dependencies are introduced for the user.
2. It does not conflict with existing node installs on the user's machine
3. No online requirement is introduced for the compiler (e.g. to use npm)
4. The files included should be minimal.
5. The build can handle new dependencies in the compiler without needing changes to the deployment and packaging.

Given that npm-bundle generates a .tgz, which doesn't unpack on Windows without additional tooling, I opted instead to work from the repo directly. Most of the grunt work is done in the Makefile copydev.in (which is preprocessed to generate copydev.mak during the Keyman Developer build).

I'm not that happy with including node.exe (32 bit) in the repo but it is the simplest consistent way I've found so far. Any suggestions for improving this appreciated.

Note: this is designed for Windows users. For other platforms (or existing Node users), I intend to publish @keymanapp/lexical-model-compiler (name?) in npm.

[keyman-server]

OSK renders for Windows

[keyman-server]

OSK renders for Windows

[eddieantonio]

So far so good! I've merged beta into #1983. It also now finds word lists relative to the path of the model.ts file — not the current working directory! I'm looking forward to simplifying the documentation in help.keyman.com!

P.S., I think the name @keymanapp/lexical-model-compiler is fine!

[darcywong00]

lgtm