Reworks settings to easily include/exclude symbols for git code lens

Removes unneeded typings file

Converts type/const into string enums
Refactors command initialization

Adds new open file revision command with annotation support

Updates changelog

Tightens up spacing as well

That being:
- The removal of the 'open in remote' and 'show commit details' commands for uncomitted changes.
- The removal of the diff message when there is no previous commit available (e.g. the line was never changed after comitting the file).