Add clone() methods to AsepriteSpriteSheet and AsepriteResource

[mattjennings]

===:clipboard: PR Checklist :clipboard:===

• 📌 issue exists in github for these changes
• 🔬 existing tests still pass
• 🙈 code conforms to the style guide
• 📐 new tests written and passing / old tests updated with new scenario(s)
• 📄 changelog entry added (or not needed)

==================

Closes #126

Changes:

• Added clone() method to AsepriteSpriteSheet
• Added clone() method to AsepriteResource

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The integration tests are failing for me on main:

Test: A Aseprite parsed resource
        Expect: Aseprite Loop Animation
[ERROR]: Image ./test/integration/images/expected.png did not match acutal ./test/integration/images/actual.png, 146 different!

but unit tests all pass.

I'm also willing to revert the commits for adding clone to AsepriteResource, but if we're okay with how it's implemented, I quite like having it. Cloning the resource over digging into the spritesheet/anims is much cleaner in usage.

[eonarheim]

@mattjennings I'll look into the integration test, I wouldn't have expected your changes to cause the failure. Possibly a browser/platform rendering difference? Looks like it passes in CI though.

[mattjennings]

If it passes in CI then great!

Yeah, I am not too sure what causes it. Smells like curse of the M1 Mac again... is there a way to know which browser ex-test uses?

Here are the expected/actual/diff images it produced:

[eonarheim]

@mattjennings Agree, it's probably that M1 Mac issue we ran into on the main repo.

You ready for me to merge with CI passing?

is there a way to know which browser ex-test uses?

This is a good question, I'll poke around 👍

[mattjennings]

Yup it's good to go!

[eonarheim]

@mattjennings Thanks again!