Removed infile features

[lebensterben]

There are multiple issues regarding infile support.

Notably,

• It doesn't support some basic syntax of BitBake.
• It doesn't fully comply to BitBake's conventions.
• The differences from BitBake is not well-documented.

Since this is never used, I propose to remove this functionality entirely.

#645
#646

[phmccarty]

@lebensterben I am okay with removing these features, but I would prefer not to see all of the code style changes interleaved in the same commit... Did your editor make the style changes automatically?

If you would like to make some changes to code style, make a separate commit (with rationale in the commit description if necessary), and make sure that the changes apply to the entire code base. Or you can omit the style changes from this PR if you prefer.

[lebensterben]

Yeah. emacs reformatted some files according and reordered imports.

[lebensterben]

It's done now.
BTW, would you add a .editorconfig or .flake8 file to the root, so that modern editors can use your per-project style settings?

[phmccarty]

The flake8 config is already enforced by Github Actions. You can run the checks locally by running make check. The behavior is controlled via the toplevel setup.cfg.

I like the idea of adding a .editorconfig, since it can cover basic style issues. Opened an issue for that: #648

[phmccarty]

@lebensterben It looks like all test files under tests/testfiles/bb/ can be removed as well? Can you check that?

Otherwise, changes look good to me.

[lebensterben]

@phmccarty I removed them (tests/testfiles/bb) in the new commit.

[phmccarty]

+1, thanks!