Upgrade native dependencies to N-API

See: https://medium.com/the-node-js-collection/n-api-next-generation-node-js-apis-for-native-modules-169af5235b06

This concerns:

• wotb
• naclb
• sqlite3?

More recent article: https://medium.com/the-node-js-collection/n-api-next-generation-apis-for-node-js-native-addons-available-across-all-lts-release-lines-4f35b781f00e

closed