MSC3873: event_match dotted keys (#3873)
* Add proposal
* Insert MSC number
* Fix spelling
* Clarifications & remove backwards compatibility.
* Mention how this blocks features.
* Fix typos.
Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>
* Clarify tense.
Co-authored-by: Alexey Rusakov <Kitsune-Ral@users.sf.net>
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Co-authored-by: Patrick Cloke <patrickc@matrix.org>
Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com>
Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>
Co-authored-by: Alexey Rusakov <Kitsune-Ral@users.sf.net>
