apply_event: Use stream_ids, not names, for add/remove.
apply_event: Use stream_ids, not names, for add/remove.

It's always cleaner to work in id space.  It probably
would have required a perfect storm to have broken
the existing code, but using ids is obviously more
robust in theory, and just as simple.

andersk/zulip,eeshangarg/zulip,zulip/zulip,eeshangarg/zulip,hackerkid/zulip,eeshangarg/zulip,punchagan/zulip,hackerkid/zulip,punchagan/zulip,hackerkid/zulip,andersk/zulip,rht/zulip,punchagan/zulip,kou/zulip,zulip/zulip,hackerkid/zulip,rht/zulip,kou/zulip,hackerkid/zulip,eeshangarg/zulip,andersk/zulip,andersk/zulip,punchagan/zulip,eeshangarg/zulip,zulip/zulip,eeshangarg/zulip,punchagan/zulip,kou/zulip,hackerkid/zulip,andersk/zulip,kou/zulip,zulip/zulip,rht/zulip,punchagan/zulip,kou/zulip,andersk/zulip,zulip/zulip,rht/zulip,rht/zulip,rht/zulip,zulip/zulip,andersk/zulip,punchagan/zulip,kou/zulip,eeshangarg/zulip,zulip/zulip,kou/zulip,hackerkid/zulip,rht/zulip