handling caption track errors without interrupting the search

This release fixes the error logging introduced in v2.1.0 - specifically the time stamp format in log file names, enabling error logs to be actually written.

It adds

• handling & logging of individual caption track errors without interrupting the search
• outputting playlist or video URLs in the search result header for easier navigation and debugging
• outputting video title in search result as context even if it doesn't contain a match

added error logging

This release fixes a bug in v2.0.0 that occurs when not using file output
and adds error logging to file.

repairs and extensions

This release fixes getting YouTube video info by updating YoutubeExplode to latest version.

That made a breaking change in the SubTubular API necessary - i.e. changing the -l or --latest parameter to -t or --top because YoutubeExplode v6 does not return the uploaded date for the videos in a playlist any longer, making the original functionality hard to implement efficiently.

Additionally, it adds new features for outputting the search results as either a text or HTML file containing hyperlinks.

"works on my machine"

...which is a 64bit Windows. Let me know how the UX is on your end in the issues.