Implement event redaction #768
This PR also includes a minor database fix taken from #696.
This PR doesn't provide full check on redactor's power level yet, which should be fixed at some point later, together with Dendrite's other power level TODOs. Another aspect in which it can be improved is that some similar code appearing in both roomserver and syncapi may be able to get factored out somewhere.
Signed-off-by: Alex Chen firstname.lastname@example.org
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