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Merge features from dev to master

See merge request !11

Authentication later on will break if the referer is
`https://www.video.ethz.ch/...` instead of `https://.video.ethz.ch/...`

Lectures with no video uploaded yet will give a 404 HTML site even on
the `*.series-metadata.json` path. Naturally this will cause the JSON
parsing to fail. We still might want to download other lectures though,
so we just skip this particular one.

Merge features from dev to master

See merge request !10

...between episodes

The return value of `get_video_src_link_for_resolution()` would override
user choice for the next episode with the actual value of the current
one.

Accidentally copy and pasted the test names without changing them

Two videos were previously always downloaded in `low` resolution but
there actually existed 4 options which meant that previously `low` was
not actually the lowest quality

Instead of vague `high`, `medium`, `low` which didn't always line up
with what exists, use exact resolution instead.
If exact resolution doesn't exist, use the next closest one.
Filenames now include the value of the actual resolution.
Keywords `highest` and `lowest` allow downloading the highest and lowest
quality respectively
Default resolution is HD as it should provide the optimal trade off
between high enough for small text in video to be readable while not
straining users' devices and connections or ETH's servers.

...resolution to own function

That way it's easier to rewrite in the future

Variable is used to store a list of available resolutions

Newer recorded lectures now also contain the seconds of the upload date
in the timestamp.
Fix by selecting the number of desired characters from the beginning of
the string instead of stripping undesired off at the end

If the user pastes a YouTube or Zoom link, give directions for software
to download media from those sources.

Merge features from dev to master

See merge request !9