Enhancement: Default Configuration Properties

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These stem from my review.

Simple Renames

• Refactor Config: Simple Renames #497

Complex Renames

These involve changing logic.

• Refactor Config: auto-pay-mode: true➔payment-permits-max-price: 1000 / ref #493
• Refactor Config: base-multiplier: 1000➔price-multiplier: 1 / ref #494

New Features

• Refactor Config: Automatically Derive weight / ref #495
• Refactor Config: mdast element keys as HTML entities / ref #496

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