add user-friendly, promise-based SQL.Worker class (in 65 lines-of-code) and deprecate dist/worker.sql-xxx.js#378

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kaizhu256 wants to merge 4 commits intosql-js:masterfrom

kaizhu256:sql.worker

Commits on Apr 1, 2020

- make src/worker.js isomorphic (will load in web-worker, nodejs, and browser without errors).
kaizhu256
committed
- update Makefile to include isomorphic src/worker.js in all javascript dist-files
kaizhu256
committed
- update src/api.js with new class SQL.Worker and promise-method SQL.Worker.postMessage
kai.zhu
committed
- fix out-of-order tic() toc() in examples/GUI/gui.js
kai.zhu
committed