Freeform tags updates

[Xemdo]

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Problem/Feature

Added deprecations for old tags systems, and confirmed support on everything for freeform tags

Description of Changes:

• Updated old tags APIs to respond with 410 Gone
• Updated endpoints to exclude valid references to tag_ids (returns nil/empty now)
• Moved channel.update beta to verison 2, while we're here
• Also while we're here, deprecated Soundtrack API endpoints so they'll respond with 410 Gone

Checklist

• My code follows the Contribution Guide
• I have self-reviewed the changes being requested
• I have made comments on pieces of code that may be difficult to understand for other editors
• I have updated the documentation (if applicable)