Adds authors filtering to commits

Splits get commit branches into 2 methods

Consolidates into a single method call

Improves commit tooltips

Uses new log parser for contributors & refs
Removes shortlog references

First pass at converting "blame" commits into a unified model

Adds changes diff for first commit changes

Since we are using native date formatting the formatter abstraction is no longer needed

Adds app/env to startup logging

Refactors Git static class into an instance (so it could be re-used for vsls)
Reworks vsls guest for better stability

Avoids 'system' imports

Reworks revision uris to use a packed authority for better stability

Need to defer this more, but this should help some

Since microsoft/vscode#3025 is now fixed, file watching works outside the workspace