Ephemerald 1.3

This update to everyone's favourite Tracery editor written from scratch in Swift contains the following changes:

• You can now select "Bulk Export" in the File menu to export a bulky number of expansions of your grammar. Currently only supports exporting 50 or 500 items. They go into a text file separated by newlines.
• Hopefully fixed the bug where the right panel would switch to an empty SVG display at random.
• I've moved over to Swift Package Management and updated everything to the most current version of the language. Doesn't change anything on your end.

Next up: I've added a help window and as soon as I've put together a help text I'll update Ephemerald again.

Cheers, 
Martin