Variables
Const OPEN_SOURCE
OPEN_SOURCE: Command = ...
Const OPEN_URL
OPEN_URL: Command = ...
Const PREVIEW
PREVIEW: Command = ...
Const PREVIEW_CATEGORY
PREVIEW_CATEGORY: "Preview" = 'Preview'
Const PREVIEW_CATEGORY_KEY
PREVIEW_CATEGORY_KEY: "vscode/extensionEditor/preview" = 'vscode/extensionEditor/preview'