Blue Billywig bid adapter update

[K-JBoon]

Type of change

• Bugfix
• Feature
• New bidder adapter
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Does this change affect user-facing APIs or examples documented on http://prebid.org?
• Other

Description of change

Bit of a messy one, as it includes the following changes:

• General code quality upgrade (Code style update)
• Correctly flag returned bids as a video mediatype (Bugfix)
• Always hit user syncs, also if we don't get bid responses (Feature)
• Validate video params, and allow submitting them additionally on the bidder params (Feature)
• Recognize VAST URL on bids in a few more situations (Feature)
• Remove DigiTrust (Maintenance)

If this needs to be split into multiple PRs please let me know.

• contact email of the adapter’s maintainer: dev+prebid@bluebillywig.com

Docs PR:
prebid/prebid.github.io#2198

[K-JBoon]

Hey @ncolletti , just wondering if you needed any additional info for the review?

[K-JBoon]

Hi @ncolletti / @mkendall07 , would really like to get an update on the progress/any blockers here, or have it re-assigned for review.

[ncolletti]

Sorry for the delay. These changes look good to me.

[K-JBoon]

@ncolletti All good, thanks for the review!