Declare support for Matrix 1.7

*This issue was originally created by [**@S7evinK**](https://github.com/S7evinK) at .*

[Complete changelog v1.7](https://github.com/matrix-org/matrix-spec/blob/e40d9ca18676fc774b39f30b44998d7f0118596a/content/changelog/v1.7.md)

### Client-Server API

Backwards Compatible Changes

- [ ] Changes to the server-side aggregation of `m.replace` (edit) events, as per [MSC3925](https://github.com/matrix-org/matrix-spec-proposals/pull/3925).
- No event aggregation at all atm
- [ ] Add new push rule conditions `event_property_is` and `event_property_contains`, as per [MSC3758](https://github.com/matrix-org/matrix-spec-proposals/pull/3758) and [MSC3966](https://github.com/matrix-org/matrix-spec-proposals/pull/3966).
- [ ] Add `m.annotation` relations (reactions), as per [MSC2677](https://github.com/matrix-org/matrix-spec-proposals/pull/2677).
- (No aggregation?)
- [ ] Support asynchronous media uploads, as per [MSC2246](https://github.com/matrix-org/matrix-spec-proposals/pull/2246).
- [ ] Document the `m.mentions` property; the `.m.rule.is_user_mention` and `.m.rule.is_room_mention` push rules; and other notification behaviour, as per [MSC3952](https://github.com/matrix-org/matrix-spec-proposals/pull/3952).
- [ ] Update the scope of transaction IDs, as per [MSC3970](https://github.com/matrix-org/matrix-spec-proposals/pull/3970).
- [ ] Add an ability to redirect media downloads, as per [MSC3860](https://github.com/matrix-org/matrix-spec-proposals/pull/3860).
- [ ] Add an ability to use an existing session to log in another, as per [MSC3882](https://github.com/matrix-org/matrix-spec-proposals/pull/3882).

Spec Clarifications

- [ ] Clarify the sections of the specification concerning aggregation of child events. ([#1424](https://github.com/matrix-org/matrix-spec/issues/1424))
- No event aggregation at all atm
- [ ] Clarify that servers should enforce a default `limit` on a filter if one is not specified. ([#1463](https://github.com/matrix-org/matrix-spec/issues/1463))
- While I think we do, we should probably verify this
- [ ] Disambiguate using property names with dots in them during push rule processing, as per [MSC3873](https://github.com/matrix-org/matrix-spec-proposals/pull/3873) and [MSC3980](https://github.com/matrix-org/matrix-spec-proposals/pull/3980).
- [ ] Remove outdated text saying that `state_default` is 0 if there is no `m.room.power_levels` event in a room. ([#1479](https://github.com/matrix-org/matrix-spec/issues/1479))
- Worth validating
- [x] Remove fictitious `token` parameter on `/keys/query` endpoint. ([#1485](https://github.com/matrix-org/matrix-spec/issues/1485))
- [x] Remove the `dont_notify` and `coalesce` push rule actions, as per [MSC3987](https://github.com/matrix-org/matrix-spec-proposals/pull/3987).
- https://github.com/matrix-org/dendrite/pull/3242

### Application Service API

Backwards Compatible Changes

- [ ] Add homeserver->appservice ping mechanism, as per [MSC2659](https://github.com/matrix-org/matrix-spec-proposals/pull/2659).

### Identity Service API

Spec Clarifications

- [ ] Corrections to the response format of `/_matrix/identity/v2/store-invite`. ([#1486](https://github.com/matrix-org/matrix-spec/issues/1486))