Causes too much confusion vs -G which better matches user expectations

Changes & Details hovers now know about staged vs unstaged changes
Significantly increased accuracy with the following:
  - Open Line Changes with Previous Revision
  - Open Changes with Previous Revision
  - Changes & Details hovers

Since we are going forward in time, the changes didn't make sense

Updates vsls git whitelist

Removes getRecentLogCommitForFile

Fixes scrolling to accurate line numbers when diffing in history

Adds GitService.getWorkingUri
Removes WorkspaceFileExistsRequestType from vsls protocol

Adds a Show All command to the Show More nodes
Improves experience after starting a new search or compare
Fixes issues with maxCount == 0

Reworks file status parsing -- uses consistent regex now

Adds `${committerAgo}`, `${committerAgoOrDate}`, `${committerDate}`
Repurposes `${authorAgo}` & replaces current ones w/ `${author}, ${ago}`
Repurposes `${authorAgoOrDate}` & replaces w/ `${author}, ${agoOrDate}`
Renames defaultDateType to defaultDateSource
Points format settings to new formatting wiki

Fixes #537

Reworks branch parsing to use for-each-ref

Disables commands for the deleted or missing sha
Adds getNextDiffUris & getNextUri
Renames getDiffWithPreviousForFile to getPreviousDiffUris
Renames getPreviousRevisionUri to getPreviousUri

Reworks file status parsing -- uses consistent regex now

Adds getDiffWithPreviousForFile & getPreviousRevisionUri

Adds originalPath token

Adds hovers.changesDiff setting for line vs hunk diff