WIP: feat(update_backlog): change CLI to permit demotion and demote-p… #370

Job	Run time
cargo-deny	18s
block-autosquash-commits	0s
Rustfmt (stable)	11s
Check (ubuntu-latest, stable)	33s
Check (ubuntu-latest, beta)	37s
Check (windows-latest, stable)	1m 19s
Check (windows-latest, beta)	1m 16s
Check (macOS-latest, stable)	45s
Check (macOS-latest, beta)	38s
Documentation (stable)	34s
Clippy (stable)	37s
Documentation (beta)	31s
Test Suite (ubuntu-latest, stable)	1m 0s
Clippy (beta)	32s
Test Suite (ubuntu-latest, beta)	57s
Test Suite (windows-latest, stable)	2m 12s
Test Suite (windows-latest, beta)	1m 44s
Test Suite (macOS-latest, stable)	59s
Test Suite (macOS-latest, beta)	1m 8s
	15m 51s

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