Bulk create/update

[DanielRunningen]

This is just a draft to get a really important feature addressed. It should close #246 and possibly resolves #269 as well.

I propose two things:

• Simply loop through the items provided by Zotero and iterate over their creation. I removed the call to open the created notes, since that could get excessive.
• Since highlighting multiple documents in Zotero only provides the "Create Literature Note(s)" option, simply allow this option to update notes that already exist. Typically I like to have everything call an update function, and then forward the request to create if the item doesn't exist, but the reverse should do fine.

Doing a bulk import with these changes does still trigger the Obsidian menu to choose attachments for some of the items, but I feel like this is unavoidable and any assumptions made during import could be the wrong ones, so this part of #269 might be unavoidable.

I tried not to touch too many files, since this is all reverse-engineered from the Obsidian console. I would be happy to add/improve these changes, but I'd need some tips on building the repository.

[DennisFriedl]

Two important features. Thanks for working on it

[DanielRunningen]

For folks who want to be able to use this without waiting for the full PR to be approved, here is my modified main.js as a zip file. It also includes the date fix from my other PR.

To use it:

• Download and unzip the file (it should just be the one file).
• Place in your workspace under .obsidian/plugins/zotlit/. It will replace the main.js that's already there.
• Either re-launch Obsidian or reload the ZotLit plugin.

[!WARNING] I can't guarantee that this won't break something, so if you run into trouble with it, or suddenly don't trust me as a stranger on the internet, you can uninstall ZotLit as a plugin from Obsidian and re-install it. Your templates should remain unaffected.

Edit: clarifications