A conversational element, with content, contributors and other metadata. A blip may be logically deleted, but remain as a parent to non-inline reply threads. A deleted blip is usable only as an accessor to its reply threads, to check if it is deleted, and to attempt deletion again. If those reply threads are subsequently removed then the blip is also removed. TODO(anorth): add setLastModifiedTime, addContributor, when metadata is no longer implicit.
@author anorth@google.com (Alex North)
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