Support for tweet-threads and related changes

[twoscomplement]

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For consideration/discussion wrt issue #23

• Omit the horizontal rule between tweets where one is a reply to the previous tweet
• Add an anchor to each tweet
• Remove the "Replying to" header - instead, link @ names to the tweet (on twitter) being replied to
• When outputting replies to self that don't immediately follow the tweet being replied to, print an up arrow ↑ that links to the anchor of the previous tweet in the thread
• When outputting a tweet that has replies that don't immediately follow, print down arrows ↓ that link to the anchor of each reply

(I'm not sure of the method of linking is actually useful - id's and filenames are valid, but may need to be expressed differently to work as intended in practice)

[timhutton]

@twoscomplement The links mostly seem to work in the md files, when viewed in Visual Studio Code at least. They take you to the right file but don't necessarily scroll down to the right place.

[timhutton]

I like that it doesn't change the order of the tweets.

[twoscomplement]

I'll look into reworking this once #67 is merged - might take me a few days

[lenaschimmel]

Hi @twoscomplement, are you still interested in finishing this PR? PR #67 is merged now. Is there anything we can do to assist? Or would you like someone else to take over your PR and finish it? Either way it's fine.

(I also changed the title slightly, so it's not confused with multi-threaded implementation)

[twoscomplement]

Hi @lenaschimmel - thanks for asking, I've been short on time to revisit this.

If there's someone else interested in picking this up, I'd be happy for them to do so - and happy to to cheer and/or review the work :slightly_smiling_face: