Implement standardized `webkit` prefixed properties

[asamuzaK]

Without prefix:

• -webkit-column-rule-color -> column-rule-color
• -webkit-text-emphasis-color -> text-emphasis-color

Renamed:

• -webkit-border-after-color -> border-block-end-color
• -webkit-border-before-color -> border-block-start-color
• -webkit-border-end-color -> border-inline-end-color
• -webkit-border-start-color -> border-inline-start-color