Queue Catch-Up. Ready fixes and green feature MRs, all re-rolled onto the post-3419618 code with tests.

Bugs: #3616606 active_updating: false ignored, #1115740 retro update skips old revisions (11 followers), #3149644 retro update vs translations, #3045063 redirect hash mismatch, #3494240 redirect on new entities, #3432653 getType() on bool, #3207007 double slash on empty token, #1211546 stale token cache on install.

Features: #3608361 [file:delta] token (MR !71 green; closes #3058449 as duplicate), #2072237 programmatic disable (16 followers; MR !70 supersedes !62 with credit), #3187675 temp upload location tokens.