Themes are now controlled with a class on the body element.
If a preference is set the body element will have either "dark-theme"
or "light-theme" class. If no preference is set or the preference is
empty the class will be "no-theme".
"dark-theme" and "light-theme" are handled by darktheme.css and
lighttheme.css respectively.
"no-theme" is handled by default.css where depending on the value of
"prefers-color-scheme" the styles corresponding to "dark-theme" or
"light-theme" are applied.
Unfortunately this means that both themes are duplicated, once in the
theme .css and once in default.css.
The index was set to index - 1, causing the first video to be shifted in fetch_playlist_videos
(because of its index being -1 lower than it should) and thus not displayed on playlist page.
Using the player on latest Safari, the tooltip appears and stays stuck for long even when switching to fullscreen which is annoying. You need to explicitly click anywhere to dismiss that stuck tooltip.
This doesn't seem to happen in Firefox so I am not sure whether this is a browser bug, but in any case I don't see any value in keeping this tooltip so maybe we can just remove it?
In practice with the patch I usually see backoff to 2 hours when blocked, so it should improve recovery time. The lim_thread is to work with multi-threading, not sure if it's the best way to do it.
* Use new API to fetch videos from channels
This mirrors the process used by subscriptions.gir.st. The old API is
tried first, and if it fails then the new one is used.
* Use the new API whenever getting videos from a channel
I created the get_channel_videos_response function because now instead
of just getting a single url, there are extra steps involved in getting
the API response for channel videos, and these steps don't need to be
repeated throughout the code.
The only remaining exception is the bypass_captcha function, which still
only makes a request to the old API. I don't know whether this code
needs to be updated to use the new API for captcha bypassing to work
correctly.
* Correctly determine video length with new api
* Remove unnecessary line
