YouTube event hooks

[mchangrh]

YouTube still fires some events globally and we can use those events in order to better prepare/setup asyncronously

yt-navigate-finish

• videoID change notifier, can also see what pageType is targeted and if SponsorBlock should be active and if so, in what capacity (document vs url lookup)

yt-navigate-start

• videoID change queued, indication to flush videoID for waiting navigate-finish

yt-navigate

• reveals videoID target, which allow use the document or URL has changed

yt-player-updated

• listen for player state updates to reliably change over after advertisements
• reliable videoID lookup

events

• yt-navigate-finish
• yt-navigate-start
• yt-nagivate
• yt-player-updated

[mchangrh]

.take

[mchangrh]

should have been closed by #1425