V2 : enhance webrequire to support node_modules

[z3dev]

WORK IN PROGRESS. DO NOT MERGE

These changes enhance webRequire() to support:

• module lookup by relative paths (same as before)
• module lookup from directories (index, index.js, 'main' from package.json)
• module lookup by module name (from node_modules hiearchy)

The algorithm follows the NODE module lookup pseudocode.

This is a BIG ONE!!!

I was able to extend the webrequire logic to follow NODE exactly. I've thrown everything possible as this, and everything works! Really!

@kaosat-dev BIG KUDOS!!! Your implement was brilliant! It just needed a few tweaks to support node_modules.

Completes #245

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[z3dev]

jscad_test_projects.zip

[z3dev]

@kaosat-dev if you have time to review them let me know, otherwise this will be merged soon.

[z3dev]

Last review. No further changes required.