Closes #470 - Adds fetch command to Repository explorer

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

Renanes "Compare x with" commands

Also adds icons for prev/next and places them into the editor toolbar

Adds inline commands to explorer

- Removes mix-tree support
  - Avoids nesting on the current branch
  - Caches basename
  - Replaces folder icons with theme icons
    - Folder icons will now follow the file icon theme used
  - Fixes minor nitpicks

Add folder icon
Implement branch folder
Implement branches.layout config option
Fix branch node ordering in Tree layout
Sort branch folder containing current branch correctly
- Add current getter method to BranchNode
- Implment a recursive findCurrent method on BranchFolderNode
Do not parse invalid branch name as branch folder
Expand current branch folder

Tweaks the blame animation
Fixes issues with blame and the active editor

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