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

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

Fixes issue with new typescript
Pins node version to match vscode's version (7.9)

Adds menu & toolbar settings to the settings editor
Adds mode setting for settings editor
Adds sticky header to settings editor

Also fixes #286, #227, #219, #186, #151, #104, #75

Adds advanced.fileHistoryFollowsRenames setting
Adds commands to set rename following to the GitLens explorer

Adds a static "container"
Adds a document tracker - replaces the context tracker
Adds a line tracker
Refactors all the things - better performance, lower overhead, less code, more separation of concerns, more maintainable (hopefully)
Changes dirty blame to only happen after a "idle" delay
Closes open file annotations on edit (too expensive to track changes)

Adds some startup performance timings

Adds comparison results view

Uses new ConfigurationChangeEvent arg

Adds auto-refresh toggling commands
Adds per-workspace state for toggling auto-refresh on/off
Adds layout selection commands

Reworks settings to easily include/exclude symbols for git code lens

Converts type/const into string enums
Refactors command initialization

Adds auto-update for working trree
Fixes issues with working tree status

Hides working changed files behind insiders flag
Unhides Changed Files node from behind insiders flag
Adds changed file count to Changed Files node label
Adds icon to Changed Files node
Adds upstream branch to upstream status nodes
Sorts files in the Changed Files node

Switches to use HoverProvider for hovers in file blames