Consolidates to node-fetch 2.6.7 as Octokit requires v2

- Adds proper error handling & messaging
  - Handles uncommitted lines
Adds open prior blame to hover on uncommitted lines

Avoids saving/re-saving object if it isn't changing

Avoids re-export from git provider service

Abstracts node path imports to system/path

Adds more docs
Removes unused original file name from diff calls

Avoids default params to reduce garbage

For virtual workspaces. Will be continually converting strings to Uris

Possible catastrophic backtracking with large inputs (very unlikely in the wild)

Reorganizes local git support to exclude from web
Swaps sha1 usages to md5 to avoid needing sha1 on the web (md5 is required by Gravatar)
Avoids crypto-browserfy and imports md5.js directly
Uses platform crypto for random nonce strings

While -G & -S aren't equivalent, this gets as close as we can AFAIK

Reduces startup git calls

Adds proper reveal to repo folders
Adds reveal to contributors git commands