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

Updates stash icons

Adds stash changes to stashes toolbar
Adds apply changes to stashes menu
Fixes stash/apply changes to honor repository context

Adds fetch/push/pull to repo context menu

Adds better sorting of working tree file changes
Changes non-working tree file changes back to use status icons

Hides Show Commit Details on status files

Changes Open All Changes (w difftool) to open files, rather than dirdiff
Changes Open All Changes (w difftool) to prompt for repo when needed