Fix all recent bugs. Shift to Invidious API.

Unable to keep up with YouTube's JavaScript changes. Using the API from
an Invidious instance to retrieve search results, but playing directly
from YouTube to reduce load on the Invidious instance.

Configuration options are still in code. WIP on moving them to a
configurable file.

Signed-off-by: Joseph Nuthalapati <njoseph@riseup.net>