OEP-37 Dev Data: Evaluate whether to carry this forward or not.

[sarina]

Several OEPs were authored aspirationally, and then never implemented. Other were partially implemented, but have stalled or diverged from reality.

In order to establish OEPs as a trustworthy source of documentation, we should mark OEPs that never came to be as "Replaced" or "Obsolete" (whichever or is more appropriate). We should amend OEPs that are still relevant but mismatched with reality.

OEP-37 is one of these, as called out in #573