Adds advanced.externalDiffTool setting
Adds advanced.externalDirectoryDiffTool setting

Works around https://github.com/microsoft/TypeScript/issues/41428

eamodio/vscode-gitlens#611 added a setting for commit SHA length,
`gitlens.advanced.abbreviatedShaLength`.

This commit will add `gitlens.advanced.useAbbreviatedShaLengthForCopy`,
which will copy the abbreviated commit SHA instead of the full SHA.
Respects `gitlens.advanced.abbreviatedShaLength`.

Adds @kh0m contribution

Related Issue: #1306

Adds Hide Repositories View command
Adds Hide Line History View command
Adds Show/Hide Repositories View command to Commits view menu
Adds Show/Hide Line History View command to File History view menu

Changes fetch/pull/push on roots to affect the whole repo

Clarifies that commit will be included in push

Adds a name property to the action runner api
Bumps vscode version to use > in when clauses

Adds preview action runner extensibility api

Adds a deny everywhere option
Adds command to reset denials

Adds button to rebase editor to toggle it on/off
Adds commands to toggle rebase editor on/off
Adds settings UI to toggle rebase editor on/off

Adds git command support to terminal links