Spawn Jest command in separate shell on Windows

[stephtr]

Should fix #98, adding .cmd won't be necessary anymore.
Updating jest-editor-support was necessary, jest-snapshot and jest-typescript-parser not, but I updated them anyway.

[stephtr]

I didn't look through the other PRs, but it's probably better to close this in favor of #215.

[orta]

Ok, so #215 is now in, shall I close this?

[seanpoulter]

I'd leave it open. It's a quick change from src/JestExt.ts to the change from #215. @stephtr, did you want to have a look at this again?

[stephtr]

I'll have a look at it in a few hours.

[stephtr]

Before merging this PR index.d.ts in jest-editor-support has to be updated to include the shell property. I will submit a PR to jest.

[seanpoulter]

Aren't we pulling types from typings/jest-editor-support.d.ts?

[stephtr]

Ah thanks, I didn't notice that. Now it should be ready for merging.

[seanpoulter]

Sweet. Thanks @stephtr.

@orta, when should we use the typings from jest-editor-support?

[orta]

The ideal case is to move those typings back to jest-editor-extension every so often so others can get the value from them, but it's pretty ad-hoc

[orta]

OK, I'm going to merge and ship this - it's the only PR in this release that I can't personally verify, so if this upcoming release is broken I'll need one of you two to take a look 💃

[stephtr]

jest#5625 contains the typings update for jest-editor-support. There are two types remaining (TestResult and FormattedTestResults), which should be moved to typings/jest.d.ts as they belong to the jest package (which hasn't any TypeScript definitions at all), before jest-editor-support.d.ts can be removed.