pilisp_cli 1.0.0-alpha.12 changelog

1.0.0-alpha.12 #

Completely revamped CLI arguments, using command-based syntax now. Run help for top-level and help <command> for command-specific help.
If --env-vars provided to any of the sub-commands, PiLisp bindings are created for every entry in Platform.environment, prefixed with env/ (e.g., env/HOME).

Improved auto-complete
- Moving the cursor or typing characters clears auto-complete results.
- Entering TAB in the middle of a line does not clear already-entered text from the display (never did so from the actual buffer).
- When all completion results share a further prefix than what the user typed, that shared prefix is proactively inserted.
  - Example: mat followed by entering TAB will automatically insert math/ into the line and show all completion results for it.

Richer cli_repl with more editing commands and TAB completion for in-scope PiLisp bindings
Repo changes to make pub.dev output more useful.