QuickOpen: Rewrite using quick input widget

[joaomoreno]

• Quick Open Use List instead of Tree for the QuickPick #29096 not sure if @chrmarti or @bpasero
• Custom Views Adopt new tree for custom views #63566 @sandy081 @alexr00
• Extensions Editor @sandy081
• Comments Panel @rebornix
• Delete old tree @joaomoreno

[bpasero]

@chrmarti fyi in order to use your QuickInput for quick open it would have to be accessible from vs/editor because we have some of the quick opens functional in the standalone editor.

[sandy081]

@joaomoreno indent option is not working here:

https://github.com/Microsoft/vscode/blob/a2e8a03d55cde707b6d56b1c3532f37b442a86b0/src/vs/workbench/contrib/extensions/browser/extensionsViewer.ts#L206

[joaomoreno]

@sandy081 What do you mean?