Fixed a bug where you couldn't import Twine HTML files which had
tags written in uppercase.
Fixed a bug where Twine HTML files with storeArea \<div>s with the
attribute "hidden" couldn't be imported.
Changed the MIME-type of imported TTF font files from
"application/x-font-ttf" to "application/font-sfnt", and added
"format(truetype)" to the generated @font-face CSS, and made similar
changes for OTF fonts.
Now, Twine will continue instead of crashing if, during startup, the
last opened story's format isn't available. Also, it will properly
error and quit if zero story formats are available (which should be
Changed the naming of custom story formats' Python files from
[story format name]/[story format name].py to [story format
name]/header.py, in order to fix the issue where if a user renames
the story format's directory, the custom Header file will no longer
be found. However, old story formats which still use [story format
name].py should continue to work correctly.