Use ffi-napi, ref-napi, and related Node.js NAPI packages

[joelpurra]

Forked and fixed quite a few more things: https://github.com/node-ffi-packager/node-libclang

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Note: includes commits from previous pull-requests. Should be merged to master one by one, but wanted to showcase the stepwise progress and allow for feedback.

• https://github.com/tjfontaine/node-libclang/pull/16
• https://github.com/tjfontaine/node-libclang/pull/17
• https://github.com/tjfontaine/node-libclang/pull/18

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• The original ffi, ref, and ref-* packages are outdated and unmaintained.
• Fixes build/compatibility problems with Node.js v12+.
• Uses node-ffi-napi.
• Uses the dependency injection (DI, -di suffix) versions of ref-* with ref-napi.
• Tested with Node.js v10 and v12, the currently supported LTS versions.

See

• https://github.com/node-ffi-napi
• https://github.com/nodejs/Release

[joelpurra]

Forked and fixed quite a few more things, might help someone: https://github.com/node-ffi-packager/node-libclang