Make generated file edit warning optional

[lggomez]

Fixes #1499
To achieve this we include the property ignoreGeneratedCodeWarning on the workspace level settings, and a "Don't Show Again" option on the warning message

[msftclas]

All CLA requirements met.

[lggomezml]

I've got these tests failing which come from master (I branched from 9b6dd0b):

2 failing
console.pub.js:42
  1) Go Extension Tests
console.pub.js:42
       Gometalinter error checking:
     TypeError: Cannot read property 'line' of undefined
      at util_1.getGoVersion.then.goCheck_1.check.then.diagnostics (/Users/lgomez/DEV/GITHUB/vscode-go/test/go.test.ts:392:39)
      at <anonymous>
      at process._tickCallback (internal/process/next_tick.js:109:7)
  2) Go Extension Tests
console.pub.js:42
       Test Linter for Package:
     TypeError: Cannot read property 'msg' of undefined
      at util_1.getGoVersion.then.goLint_1.goLint.then.diagnostics (/Users/lgomez/DEV/GITHUB/vscode-go/test/go.test.ts:868:33)
      at <anonymous>
      at process._tickCallback (internal/process/next_tick.js:109:7)

I will merge back as soon as master gets stable (fixed in #1538)

[ramya-rao-a]

We already in a state where we have way too many settings. Adding another when there are other ways to do this is not preferable.

Instead, you can use the local storage to store the user choice of not to show the warning again. See https://github.com/Microsoft/vscode-go/blob/0.6.77/src/goMain.ts#L89 on how to update and https://github.com/Microsoft/vscode-go/blob/0.6.77/src/goMain.ts#L78 on how to read from the local storage. In the linked example, we update/read the Go version

[ramya-rao-a]

Thanks!

[ramya-rao-a]

@lggomez This feature is now available in the latest update (0.6.78) to the Go extension. Thanks for the PR!