v0.21.0

What's Changed

• feature: Drag with the mouse to select text within a single pane (file tree or diff); the selection is copied to the clipboard on release.
• ux: Soft-wrap is now on by default (set "wrap": false in the config or press w to turn it off).
• ux: The footer shows only the essential shortcuts for each view; everything else is in the ? help.

Full changelog: v0.20.0...v0.21.0