Adds whitelist for allowed git methods to be run on the host

Keeps all path manipulation on the host rather than guest
Fixes shared/local path munging for mac/windows
Keeps current user lookup local when a guest
Keeps difftool lookup local when a guest
Avoids fetch date lookup when a guest
Stops clearing node_modules (for now)

Enables source maps always
Minifies css
Removes unused plugins

Adds search commits button to view

Updates README (wip)
Updates welcome & settings pages (wip)

Adds ability to start a compare directly from the view

Renames showCommitInResults to showCommitInView
Renames showFileHistoryInResults to showFileHistoryInView

Adds Change Base (branch/tag) command to line history view

Adds @command decorator
Changes (fetch|pull|push)All to be cancelable

This avoids unnecessary flickering of the GitLens side bar icon

Config when's can be resolved before extension activation

Adds push with force command to repo nodes

Switches to use full source-map for better debugging (stepping)

Adds codeLens.includeSingleLineSymbols setting

Adds show file history in results command