There are two big changes here. Both have to do with how we want
to load casks in different scenarios. One also is related to formulae.
1. Prevent loading casks & formulae outside of taps for specific commands.
There are certain commands like `bump`, `bump-*-pr`, `livecheck` and `audit`
where it really makes no sense to try and run things if the specified formulae
or cask is not in a tap. A new `#to_formulae_and_casks_with_taps` method was
added to the `CLI::NamedArgs` class to allow us to easily grab and validate
formulae and casks from named arguments.
2. Always load the source file path when loading casks with the path loader.
There was an edge case where all JSON cask files were being loaded without
setting the source file path because most of the work was handed off to the
API loader where that normally would make more sense. Now we set that when
calling the API loader which solves the problem. This improves the user
experience of people using the `--cache` and `fetch` commands in certain
edge cases. Hopefully it makes the user experience a bit more consistent.
A regression test was added for this point.
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