Going to hold off on this until sourcelair/xterm.js#224 is merged.

This reverts commit 0a5a071c.

[Terminal] Run entire text if selection is empty

Also add the rest of the commands.

Part of #10302

Part of #7269

Fixes #7269

Windows: ctrl+up/down
Linux: ctrl+shift+up/down
Mac: cmd+up/down

Fixes #10302

fixes #10263

This reverts commit b01fb0bf.

This reverts commit 3a52eb26.

fixes #10194

moveEditorToRightGroup should not attempt to move the editor when it's the only editor in the group (fixes #9873)