v0.5.0-alpha.10

This is an alpha release, but new servers should use this version rather than an older "stable" one.

Features:

• Make artist, title optional when adding playlist items (#516).
  With this change, deriving the artist and title for a search result can be deferred until it
  is actually added to a playlist. Then the search can show only original titles, which makes
  finding the correct result easier, and is required for compliance with ToS for some services.

Internal:

• Breaking: üWave now requires Node.js 14.17 or above. (#513)
• Use UUIDs for chat message IDs. (#511)