Updates changelog

Tightens up spacing as well

That being:
- The removal of the 'open in remote' and 'show commit details' commands for uncomitted changes.
- The removal of the diff message when there is no previous commit available (e.g. the line was never changed after comitting the file).

Changes ${path} token to be the full path
Adds relative formatting support

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

Adds ability to automagically set the width of the gutter annotations

Adds new contributor to readme

Reworks commit-file nodes

Switches to use HoverProvider for hovers in file blames

Optimizes annotation computation (cache by commit)