Pre-built custom sql.js for sqliteviz (#62)

* Proof-of-concept pre-built custom sql.js

* Rewrite Makefile as a couple of comprehensible Python scripts

* Add link to a blog post about transitive closure in SQLite

* Remove eval extension -- no much point as it only returns a string

* Consistently use existing Path objects

* Add basic tests scalar functions from extension-functions.c

* Test presence of functions from the rest of built extensions

* Use the same sqlite.com domain

* Add a couple SQLite compile flags that may make it a bit faster

* Add regexpi function test

* Add node about regexpi and REGEXP operator

* Workaround first build failure, rebuild lock file and minor fixes

vue.config.js

@@ -3,6 +3,9 @@ const WorkboxPlugin = require('workbox-webpack-plugin')
 
 module.exports = {
   publicPath: '',
+  // Workaround for https://github.com/vuejs/vue-cli/issues/5399 as described
+  // in https://stackoverflow.com/a/63185174
+  lintOnSave: process.env.NODE_ENV === 'development',
   configureWebpack: {
     plugins: [
       new CopyPlugin([