Adds comparison results view

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 "progress" state to file annotation command

# Conflicts:
#	src/commands/stashApply.ts

Adds templating support to explorer views

Moves annotation messages from formatter to annotations
Moves icons into dark/light folders