LegendKeeper 0.17.1.2

Improved WorldAnvil zip import tool. Import now:
- Does its best to interpret article hierarchy
- extracts @-mentions
- pulls out some metadata fields into the right sidebar
- empty articles that act as folders start with a subpage index
WorldAnvil's export data is incomplete and does not provide enough data to reconstruct:
- maps
- timelines
- family trees
- pretty much anything besides text articles
- I recommend submitting feedback to WA if you'd like the export/import process to support more content.
- More improvements to come, like automatic image re-hosting.
Fixed some issues related to Whiteboard size being inflated by copy-paste bugs