Track which settings were contributed by extensions

This reverts commit 8e03e031.

Fix #51597 - move searching with absolute path queries out of search service and into openFileHandler

Fix #51597 - move searching with absolute path queries out of search service and into openFileHandler

* Fix #35361: fix native tabs on macOS 10.13

macOS 10.13 mistakenly enables a compatibility option on VS Code
and VS Code Insiders because their bundle IDs begin with
"com.microsoft.". This breaks native tabs.

Explicitly disable the compatibility patch using NSUserDefaults.

Note that Code-OSS is not affected by the bug, since its bundle ID
is "com.visualstudio.code.oss". To test this behaviour, change
darwinBundleIdentifier in product.json.

* set NSUseImprovedLayoutPass only when window.nativeTabs: true

fixes #50866

Fixes stuck hover widget when triggered manually, with "editor.hover": false

max_old_space_size flag out of range for 32-bit builds.

- Get recommendation source along with recommendations
- Add recommendation source to extensions
- Adopt recommendations for muliple management