This commit does major overhaul of "upgrade" subcommand,
reducing complexity & giving more sensible console output.
Removes gz support for archives.
Uses last part of url instead of scraping to get latest version.
This commit moves following tools into a single "tools"
module located at "cli/tools/mod.rs":
- formatter
- linter
- test runner
- coverage collector
- installer
- binary upgrader
- repl