(core) Faster builds all around.

Summary:
Building:
- Builds no longer wait for tsc for either client, server, or test targets. All use esbuild which is very fast.
- Build still runs tsc, but only to report errors. This may be turned off with `SKIP_TSC=1` env var.
- Grist-core continues to build using tsc.
- Esbuild requires ES6 module semantics. Typescript's esModuleInterop is turned
  on, so that tsc accepts and enforces correct usage.
- Client-side code is watched and bundled by webpack as before (using esbuild-loader)

Code changes:
- Imports must now follow ES6 semantics: `import * as X from ...` produces a
  module object; to import functions or class instances, use `import X from ...`.
- Everything is now built with isolatedModules flag. Some exports were updated for it.

Packages:
- Upgraded browserify dependency, and related packages (used for the distribution-building step).
- Building the distribution now uses esbuild's minification. babel-minify is no longer used.

Test Plan: Should have no behavior changes, existing tests should pass, and docker image should build too.

Reviewers: georgegevoian

Reviewed By: georgegevoian

Subscribers: alexmojaki

Differential Revision: https://phab.getgrist.com/D3506

test/nbrowser/Fork.ts

@@ -3,7 +3,7 @@ import {UserAPI} from 'app/common/UserAPI';
 import {assert, driver, Key} from 'mocha-webdriver';
 import * as gu from 'test/nbrowser/gristUtils';
 import {server, setupTestSuite} from 'test/nbrowser/testUtils';
-import * as uuidv4 from "uuid/v4";
+import uuidv4 from "uuid/v4";
 
 describe("Fork", function() {
 

test/nbrowser/homeUtil.ts

@@ -1,7 +1,7 @@
 /**
  * Contains some non-webdriver functionality needed by tests.
  */
-import * as FormData from 'form-data';
+import FormData from 'form-data';
 import * as fse from 'fs-extra';
 import defaults = require('lodash/defaults');
 import {WebElement} from 'mocha-webdriver';
@@ -13,7 +13,7 @@ import {WebDriver} from 'selenium-webdriver';
 import {UserProfile} from 'app/common/LoginSessionAPI';
 import {DocWorkerAPI, UserAPI, UserAPIImpl} from 'app/common/UserAPI';
 import {HomeDBManager} from 'app/gen-server/lib/HomeDBManager';
-import * as log from 'app/server/lib/log';
+import log from 'app/server/lib/log';
 import {TestingHooksClient} from 'app/server/lib/TestingHooks';
 
 export interface Server {

test/nbrowser/testServer.ts

@@ -12,7 +12,7 @@
  */
 import {encodeUrl, IGristUrlState, parseSubdomain} from 'app/common/gristUrls';
 import {HomeDBManager} from 'app/gen-server/lib/HomeDBManager';
-import * as log from 'app/server/lib/log';
+import log from 'app/server/lib/log';
 import {getAppRoot} from 'app/server/lib/places';
 import {makeGristConfig} from 'app/server/lib/sendAppPage';
 import {exitPromise} from 'app/server/lib/serverUtils';

test/nbrowser/testUtils.ts

@@ -15,7 +15,7 @@
  * Run `bin/mocha 'test/nbrowser/*.ts' -b --no-exit` to open a command-line prompt on
  * first-failure for debugging and quick reruns.
  */
-import * as log from 'app/server/lib/log';
+import log from 'app/server/lib/log';
 import {addToRepl, assert, driver, enableDebugCapture, Key, setOptionsModifyFunc, useServer} from 'mocha-webdriver';
 import * as gu from 'test/nbrowser/gristUtils';
 import {server} from 'test/nbrowser/testServer';