v9.1.0

Changes since 9.0.18:

• block -NaN in tslider when range == 0 [MvGulik]
• fix crash in recover when no recover item selected [MvGulik]
• add ctrl-M shortcut to show/hide the toolkit menu
• rewritten vips8 menus
• new test suite
• better ctrl / shift modifier handling
• doubleclick on a graphicview no longer selects that row (use the label)
• fix "meson test"
• maxpair, minpair handle constants correctly
• add prewitt, scharr edge detectors
• better link creation

Use homebrew for macOS, flatpak will update shortly, Windows binaries below.