Update to the UI framework! (No changes to the game content.)

The game now supports OS dark theme. If you have your system OS theme set to "dark", all of the game windows (including the journal, map, preferences, and so on) will use a light-on-dark theme.

The *story* window will still be set to the color theme you last selected (Dark, Light, Sepia, Slate). You can adjust this to match in the preferences.

The preferences menu now has two system-responsive options: "Light/Dark" and "Sepia/Slate". These allow the story window to adjust if you switch your OS theme back and forth. I don't know why you would, but the game allows for it. (New players will see "Light/Dark" as the default preference.)

Other changes:

- The Electron framework has been updated to 8.4.1. This should fix the "harfbuzz" library error that some Linux users were seeing.
- There is a "Display Cover Art" menu option in the View menu, should you wish to bask in that.
- The Mac version is now notarized.

Various things that I've been meaning to clean up in the past year. (No changes to the game content.)

- In the journal window, you can now sort items by name or by date (the order you discovered them in the game).
- Added two new color themes: Sepia and Slate.
- Changed the "Reset" menu item to "Reset Completely" (to match the in-game command for completely starting over).
- Changed the "Close Window" menu item to "Close Game" for the main game window. (Except on Mac, sorry. The Mac's menu bar works poorly with this app framework.)
- Fixed a slight size miscalculation in the status window.
- Updated the Electron app framework to 1.4.16.