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@mjbvz @alexdima
mjbvz and alexdima Let core command such as undo/redo be overridden by webviews and note… 
…books (#98288)

* Add CoreCommandService

For #90110

This change introduce a new service (`ICoreCommandService`) that lets high levels parts of the editor (such as webviews) hook into core commands such as undo and redo that are fired from the editor menus.

## Why is this needed?
To implement undo/redo in custom editors / webviews, we currently register special commands (`editor.action.customEditor.undo` and `editor.action.customEditor.redo`). This is not ideal since it means that users have to update multiple commands if they wish to rebind undo/redo

These custom command also are not invoked when the user goes to the `edit` menu and select `undo` or `redo`. Instead, the edit menu always calls the core `UndoCommand`

We cannot make `UndoCommand` know about custom editors because it lives in `base`

## What this change does?
This change adds a new `ICoreCommandService` that lets higher level parts of the editor override core commands such as undo and redo. We use a similar approach in the `IOpenerService`.

Right now only `undo` and `redo` are overridable. If this approach looks ok, we could also extend it to `copy`, `paste`, `cut`, and `select all`

* Add docs and clean up types

* Rework implementation

Switch from using a command service to having each command state if is overrideable or not.

This hooks up overrides for:

- Undo/redo
- cut/copy/paste

for webviews, custom editors, and notebooks

* Add ProxyCommand so that multiple registered commands can share a single implementation

* Fix compilation & missing file being referenced

* Introduce and adopt MultiCommand for Undo

* Adopt MultiCommand for Redo and SelectAll

* Adopt MultiCommand for Cut, Copy and Paste

Co-authored-by: Alex Dima <alexdima@microsoft.com>
Latest commit 97650fb Jun 19, 2020

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.vscode move perf data into separate file that's ignored by search, fyi @sand… Jun 18, 2020
build switch to use iconv-lite-umd for #79275 (#100472) Jun 18, 2020
extensions [json] server path fix (for json-server npm) Jun 19, 2020
remote upgrade semver Jun 19, 2020
resources code.sh: loosen check for WSL2 Jun 19, 2020
scripts Fixes #99666 - moves code-web into resources/ Jun 9, 2020
src Let core command such as undo/redo be overridden by webviews and note… Jun 19, 2020
test sandbox - configure nativeWindowOpen:true Jun 16, 2020
.editorconfig No forcing tabsize on users Dec 19, 2018
.eslintignore remove polyfill promise Mar 2, 2020
.eslintrc.json Update eslint versions Jun 5, 2020
.gitattributes attributes: rtf files are not text Mar 19, 2019
.gitignore CI for Monaco Editor compile and bundling. Nov 12, 2019
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.yarnrc chore: bump electron@8.3.3 Jun 19, 2020
CONTRIBUTING.md Update link for automated issue management actions repository (#96568) Apr 29, 2020
LICENSE.txt remove blank line (my best checkin ever) May 1, 2020
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cglicenses.json release: prep for 1.45 Apr 28, 2020
cgmanifest.json chore: bump electron@8.3.3 Jun 19, 2020
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package.json chore: bump electron@8.3.3 Jun 19, 2020
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README.md

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