[lex]

Settings becomes a side panel like the others, as RedRafe suggested on #1670: it docks under the top buttons, the pin floats it, and the X and the top button close it.

• The info text is the panel's subheader and the list fills the inner frame under it. Save changes is in a row under the inner frame, like the buttons of Factorio's own dialogs; floating, the space beside it drags the panel, as the header does.
• The panel is wide (470), where the window was 500. The list still scrolls only past 800.
• Saving still closes it, as before. It no longer becomes player.opened, so E and Escape don't close it any more: the X or the top button do.
• docs/GUI.md lists the settings among the side panels.

Tests

• In a client, from the top button: it opens docked, the pin floats it, Save closes it and untoggles the top button, the top button reopens it floating, and the X closes it. Also checked in Russian, which has the longest info text.
• luacheck .: 0 warnings / 0 errors.

Screenshots

Docked:

Floating, with a colour picker open:

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