Workaround for black-on-black text rendering issue with flatpak

New name: EmojiClu

New icon

This release introduces an in-game tutorial to help new players learn the game.

We merge obvious sets of horizontal clues which led to an oversight in the clue pruner and leaked difficulty. The puzzles are more consistently difficult with the fix.

Fix a slight regression with hints when only hidden / naked sets exist.

game saves automatically when you close the window, and reloads on launch

hint system turns off spotlight automatically once you apply all possible deductions for the highlighted clue (myopic deductions only)

top-row emojis adjusted to help differentiate the icons

many much packaging. so much packaging. packaging for days.

Some minor puzzle generator polish also

Puzzle generation is significantly faster (10x)

Puzzle generator more actively seeks hidden sets (naked set, hidden set) and incorporates them in to the clue path

Hidden set finding logic vastly improved

Clue selection, with keyboard shortcuts (a: previous clue, d: next clue, c: complete clue, escape: deselect clue)

When getting a hint, we spotlight only relevant tiles to assist in finding the deduction

Name changed to Mind Hunt to comply with Gnome software guidelines

Windows installer script cleaned up

Also, improve event handling logic.

Puzzle background is black regardless of theme. Sorry.

Official name is now "GnomeClu"