Adds repository creation detection when there are no repositories

Adds a static "container"
Adds a document tracker - replaces the context tracker
Adds a line tracker
Refactors all the things - better performance, lower overhead, less code, more separation of concerns, more maintainable (hopefully)
Changes dirty blame to only happen after a "idle" delay
Closes open file annotations on edit (too expensive to track changes)

Fixes typings issue

Adds Merge Branch (via Terminal) command
Adds Rebase (Interactive) Branch (via Terminal) command
Adds Cherry Pick Commit (via Terminal) command
Adds Revert Commit (via Terminal) command
Adds Create Tag (via Terminal)... command
Adds Delete Tag (via Terminal) command

Adds Compare with Working command

Adds gitlens.explorers.compareWithRemote command

Fixes issues with commit paging in certain quick pick menus

Replaces spawn-rx with homegrown (stolen) implementation
Removes telemetry for now (until I get an azure account again)
Removes unused lodash modules
Removes unused testing dependencies

Reduces startup time

Adds webpack for bundling (disabled for now)
Uses tslib to bundle less duplicate code