Feature/htb account rework

[0xRy4n]

Types of changes

What types of changes does your code introduce?
Put an x in the boxes that apply.

• Bugfix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality not to work as expected).
• Documentation Update (if none of the other choices applies).

Proposed changes

This does the following:

1. Restructures the webhook code - HMAC verification, HTB account handler, etc.
2. Reworks much of the verification helper- we no longer assume an MP account and operate from the link event
3. Verify / identify cogs replaced to explain new process
4. Some misc refactoring for help facilitate the above

Checklist

Put an x in the boxes that apply.

• [x ] I have read and followed the CONTRIBUTING.md
  doc.
• Lint and unit tests pass locally with my changes.
• I have added the necessary documentation (if appropriate).

Additional context

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