Update src to build with TS 2.7

Explicitly assign this.message in the else body

* Add CodeActionScope

* Replace matches with contains, try using in ts extension

* Move filtering to getCodeActions

* Basic test

* Docs

* Fix tests

* Hooking up requested scope

* Add basic test for requestedScope

* Added auto apply logic

* Gate refactor provider to only compute refactorings when requested

* Making suggested renames

* Clean up code action trigger impl to use single Trrigger info object

* Rename codeActionScope file and internal CodeActionScope class

* Add quick fix base type

* Make keybinding API more similar to insertSnippet

Take args as an object instead of as an array of values

* Clean up docs

* scope -> kind

* Fixing examples to match Refactor kind

**Bug**
We were using `edits` in some places and `edit` in others. This broke some use patterns for code actions

Extract function for the following pattern used a number of times in `ExtHostLanguageFeatures`:

```
const handle = this._nextHandle();
this._adapter.set(handle, new OutlineAdapter(this._documents, provider));
```

Moves the `provideCodeActions2` api from proposed to the offical VS Code api. This allows code action providers to return  `CodeAction` objects

* Add CodeAction Type

Adds skeleton on a new CodeActionType and allows codeActionProvider to return either `Command`s or `CodeAction`s

Move proposed CodeAction API to proposed and try using it in TS

Split CodeAction into quickfix and refactoring classes

Update proposed interface

Update for new API

Adding basic docs

* Support workspace edits and text edits in codeactions

* Remove placeholders

* Resolving conflicts and making PR suggested changes

* Fix quick fix test

* Revert change to only use `CodeAction` instead of `CodeAction | Command` in modes since this will break `vscode.executeCodeActionProvider`

Fixes #752

Adds a new overload of `provideCompletionItems` that takes a context argument. This context is currently used to provide the trigger character of the suggestion