Provides optional additional code lens

Other fixes and refactoring

Adds commands module
Adds git commit message to blame hover decorator

And minor other positioning issues

And other git related edge cases

Decoupled from the CodeLens and less processing before it is required

Also helps move lens after other lenses

Reworked Uri scheme to drastically reduce encoded data (big perf improvement)

Dynamically pads uri index based on need

Cleaned up the blame hightlights (wip)