Support for OliveTree Bible Study Sync and new tag option

I've created an unofficial plugin to pull in annotations made within the OliveTree Bible Study application (multi-platform). They use a sync protocol that makes for an ideal method to pull in annotations and make them useful for Slogger.

In the creation of this, I wanted to support the Bible Study app's tags and annotation folders, which can be multi-word. I also annotate in Markdown, especially headings. Both of these factors were tripped up with the #hashtag scanning method of creating DayOne tags, which support multi-word tags. Adding an option for tags in the DayOne library allows all plugins to pass in their own tags, but if the option is not passed, it reverts to #hashtag scanning.