v2.4.0: Modifier steps, Variants and recipe pages

The modifier steps release.

Added

• Modifier steps: a roll's total can now go through up to three steps, in order. Add, subtract, multiply or divide (dividing rounds down). Open a roll and use Modifier steps under the dice to say "double it, then add 3" or "roll it, then halve it", and move the steps earlier or later, since +3 then ×2 is not ×2 then +3. The table reads the steps in the Mod column (+3 ×2) and in the formula, where brackets show the order: (2d6 + 3) × 2. On a roll that counts successes the steps change the number of successes, and adding still means automatic successes. A single +2 still goes straight in the Mod box as before.
• Duplicate a roll, and put rows in order. Open a roll and press the Duplicate icon beside its formula, and a copy lands directly below it, named "Longsword (2)" and already open, ready to change one thing and compare. Move up and Move down sit in the same place. The order is what the chart draws first and which rolls head-to-head shows.
• Variants: make a whole family of a roll at once. Pick what to change (the number of dice, the die, how many to keep, one modifier step, or a pool's success number), pick the range, and up to seven new rolls appear directly below, named for what changed ("Longsword · d10", "2d6 · +3"). Seven, because the chart has eight colours and the roll you started from keeps one. Before you confirm, the panel says plainly what it is leaving out and why, and the message afterwards has an Undo. Checks can't make variants yet; duplicate one and change it by hand.
• Notes on rolls. A short note under the formula, for why a roll exists or what changed from the last version. The table marks a roll that has one, a phone shows it on the card, and notes travel with the table when you share it, export it or open it on another device.
• Recipe pages: ten pages that each answer one common dice question. What 4d6 drop lowest averages, how much advantage is worth, what Great Weapon Fighting adds to a greatsword, and more. Each one is the real table with the rolls already in it, so you can read the chart, change a die and try a target right there, and nothing you do there touches your own table. Open this in my table adds the rolls after the ones you already have. An empty table lists all ten under Common dice questions.
• A new recipe in Find a roll: Roll again on a 6 and add. A plain d6 next to an exploding one, for anyone wondering what exploding dice do to the average.
• The shape of a roll now shows where most of its results land. A faint band of the roll's colour covers the middle of its results, in the small shape beside each roll, in the chart you open from it, and in the comparison chart for the roll you point at. A narrower band is a steadier roll; a flat roll like a single d8 gets no band.

Changed

• Links and files you share now use a newer format. They open in this version of DiceTable or later. If an old copy of the app is still open in another tab, it asks you to reload instead of showing the wrong numbers. Older links and files still open as before.
• A copy or a variant goes directly below the roll it came from. The rolls after it move down to make room, and each takes the colour of its new place; Move up and Move down trade colours the same way.
• The homepage now says what DiceTable is for: building, comparing and balancing dice rolls, for the games you play and the homebrew you write.
• The footer credits Clark Perfecto by name and links to the GitHub profile.

Fixed

• A DiceTable link shared in a chat app or on social media now shows a short description under its title, instead of the title alone.
• Every page now carries a single title once it has loaded, instead of its own title followed by the site's default one.
• The Find a roll recipe that compares 1d20, 3d6 and 2d6 is now called More dice, fewer extremes. Its old name, Same range, different shapes, was wrong: the three rolls cover different ranges.

Full detail in CHANGELOG.md.