Because

I was using spacingLeft/Right instead of spacingHorizontal

This PR

• use spacingHorizontal
• add auto as a spacing prop
• enable properties like p.p(3,6) transpiling to vertical, horizontal

Issue

Closes #19

Additional Information

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(Optional) Discord username

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Pull Request Requirements

• I have thoroughly read and understand Contributing Guide
• The title of this PR follows the location of change: brief description of change format, e.g. Sizing: Add padding support
• The Because section summarizes the reason for this PR
• The This PR section has a bullet point list describing the changes in this PR
• If this PR addresses an open issue, it is linked in the Issue section