This CL updates TypeScript, rollup and d3 to newer versions.

Drive-bys:
 - Remove unused source file lang-disassembly.
 - Fix typing problem with FileReader callback

The rollup version update also ensures that watch mode works again:

  npm run-script watch

Change-Id: If852bc4287760017c185fbcb6dd9d2e36db36a04
Notry: true
Bug: v8:7327
Reviewed-on: https://chromium-review.googlesource.com/c/1396091
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58551}