Refactor pager commands & synchronous shell commands (no-op) #1243
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This PR is meant to not cause any changes to functionality. It is the follow-up to #1201 and cleans up #1146.
It's designed to be reviewed commit-by-commit (though feel free do do whatever works for you). The first commit includes the changes I suggested in #1146 and #1152, the following commits are a slightly more extensive deduplication of functionality.