Declare support for Matrix 1.7

[S7evinK]

Complete changelog v1.7

Client-Server API

Backwards Compatible Changes

• Changes to the server-side aggregation of m.replace (edit) events, as per MSC3925.
  • No event aggregation at all atm
• Add new push rule conditions event_property_is and event_property_contains, as per MSC3758 and MSC3966.
• Add m.annotation relations (reactions), as per MSC2677.
  • (No aggregation?)
• Support asynchronous media uploads, as per MSC2246.
• 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.
• Update the scope of transaction IDs, as per MSC3970.
• Add an ability to redirect media downloads, as per MSC3860.
• Add an ability to use an existing session to log in another, as per MSC3882.

Spec Clarifications

• Clarify the sections of the specification concerning aggregation of child events. (#1424)
  • No event aggregation at all atm
• Clarify that servers should enforce a default limit on a filter if one is not specified. (#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 and MSC3980.
• Remove outdated text saying that state_default is 0 if there is no m.room.power_levels event in a room. (#1479)
  • Worth validating
• Remove fictitious token parameter on /keys/query endpoint. (#1485)
• Remove the dont_notify and coalesce push rule actions, as per MSC3987.
  • Implement MSC3987, fix setting Element Android notifications #3242

Application Service API

Backwards Compatible Changes

• Add homeserver->appservice ping mechanism, as per MSC2659.

Identity Service API

Spec Clarifications

• Corrections to the response format of /_matrix/identity/v2/store-invite. (#1486)