Fixes show more in file/line history

Switches to use fork-ts-checker

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

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

Adds originalPath token

Adds hovers.changesDiff setting for line vs hunk diff

Removes "Branch or Tag" from all commands
Changes openFileRevisionFrom allow entering references
Fixes missing views.compare.selectForCompare from command palette

Splits App into AppBase & AppWithConfigBase for impl of new webviews