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

Adds the gitlens icon to settings editor and welcome page

Changes changelog image links to permalinks
Moves all images for docs into a docs folder
Removes unused images

Closes #470 - Adds fetch command to Repository explorer

Closes #354 - Adds line history explorer (wip)
Closes #456 - Adds repository status to the repository nodes

Updates dependencies

Replaces git content provider with git fs provider
Adds Buffer output support to git calls

Adds new ${changes} and ${changesShort} template tokens
Adds support for prefixes and suffixes around tokens
Fixes missing/mismatched token option issues

Renanes "Compare x with" commands

Removes Uri monkey patch as it no longer will work
See 03432806c8
Stops encoding uris in .toString calls

Removes gitlens.advanced.git setting

Changes from out to dist
Adds size-plugin (commented out for now)
Adds image cache to improve bundle performance

Adds new webpack tree shaking plugin

Uses webpack for all of it