Reverted patches done for SYWEB-40
SYWEB-40: Only local rooms are shown in the recents list.
Removed an old patch that deduplicated join events. This patch is now useless. Plus it is buggy since it compared event.content and event.prev_content only on the membership field whereas these objects contain more data now like displayname...
Bump changelog and versions
Merge branch 'master' of github.com:matrix-org/synapse into develop