Fixed ref-cycle between CBLRemoteSession and CBLRestReplicator
Fixed ref-cycle between CBLRemoteSession and CBLRestReplicator

Made CBLRemoteSession.requestDelegate a weak reference.
Fixes #1438 … I didn’t take the patch from that PR because it also
makes CBLRemoteRequest.delegate weak, which I don’t want.

couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios,amco/couchbase-lite-ios,amco/couchbase-lite-ios,amco/couchbase-lite-ios,amco/couchbase-lite-ios,amco/couchbase-lite-ios,couchbase/couchbase-lite-ios,amco/couchbase-lite-ios,couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios,amco/couchbase-lite-ios