Phantom types: Logical borders

[dzuk-mutant]

Adds functions covering the following properties for the phantom-types branch:

(to my knowledge this covers all logical border properties apart from border-radius ones)

• border-block
• border-block-color
• border-block-end
• border-block-end-color
• border-block-end-style
• border-block-end-width
• border-block-start
• border-block-start-color
• border-block-start-style
• border-block-start-width
• border-block-style
• border-block-width
• border-inline
• border-inline-color
• border-inline-end
• border-inline-end-color
• border-inline-end-style
• border-inline-end-width
• border-inline-start
• border-inline-start-color
• border-inline-start-style
• border-inline-start-width
• border-inline-style
• border-inline-width

Implementing them basically just involved a lot of repetition because they share identical arguments with similar border properties.