feat: Allow custom image resource path

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===: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)

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Closes #23

Changes:

• Added optional parameter to the constructor of AsepriteResource to allow to overwrite the image path. E.g. to resolve the image path by the build tool.
• Split frame type in AsepriteRaw to AsepriteRawFrame
• Do not throw an error if frameTags is not defined