Rewrote the commander package to use colon-based commands

[matthewmueller]

A little while back, I realized that using colon-based commands instead of space-based commands was better. There are two advantages:

1. Clearer difference between args and commands.
2. Allows flags and args after the command to be in any order.

I wanted to make this breaking change early before too many people were using bud.

This change also preps us for custom commands.

Breaking changes:

1. bud new controller is now bud new:controller.
2. The tool subcommand was removed, e.g. bud tool cache clean becomes bud cache:clean.

Deprecated changes and additions:

1. bud create <dir> has been deprecated in favor of bud new <dir>.