(core) Speed up and upgrade build.

Summary:
- Upgrades to build-related packages:
  - Upgrade typescript, related libraries and typings.
  - Upgrade webpack, eslint; add tsc-watch, node-dev, eslint_d.

- Build organization changes:
  - Build webpack from original typescript, transpiling only; with errors still
    reported by a background tsc watching process.

- Typescript-related changes:
  - Reduce imports of AWS dependencies (very noticeable speedup)
  - Avoid auto-loading global @types
  - Client code is now built with isolatedModules flag (for safe transpilation)
  - Use allowJs to avoid copying JS files manually.

- Linting changes
  - Enhance Arcanist ESLintLinter to run before/after commands, and set up to use eslint_d
  - Update eslint config, and include .eslintignore to avoid linting generated files.
  - Include a bunch of eslint-prompted and eslint-generated fixes
  - Add no-unused-expression rule to eslint, and fix a few warnings about it

- Other items:
  - Refactor cssInput to avoid circular dependency
  - Remove a bit of unused code, libraries, dependencies

Test Plan: No behavior changes, all existing tests pass. There are 30 tests fewer reported because `test_gpath.py` was removed (it's been unused for years)

Reviewers: paulfitz

Reviewed By: paulfitz

Subscribers: paulfitz

Differential Revision: https://phab.getgrist.com/D3498

app/client/ui/transitions.ts

@@ -75,7 +75,7 @@ export function prepareForTransition(elem: HTMLElement, prepare: () => void) {
   // Recompute styles while transitions are off. See https://stackoverflow.com/a/16575811/328565
   // for explanation and https://stackoverflow.com/a/31862081/328565 for the recommendation used
   // here to trigger a style computation without a reflow.
-  window.getComputedStyle(elem).opacity;   // tslint:disable-line:no-unused-expression
+  window.getComputedStyle(elem).opacity;   // eslint-disable-line no-unused-expressions
 
   // Restore transitions.
   elem.style.transitionProperty = prior;