Created Issue tracker tracker: Ghost'd (markdown)

Issue-tracker-tracker:-Ghost'd.md

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+Currently using [`~Ghost'd`](https://github.com/TASEmulators/BizHawk/issues?q=label%3AGhost'd) to track all issues/PRs "by @ghost" (author deleted their acc.)—at Spike's request, that *includes those which have been identified*.
+
+@<!---->jjfmz42015:
+- [#2196](https://github.com/TASEmulators/BizHawk/issues/2196)
+
+@<!---->thecoreyburton:
+- [#711](https://github.com/TASEmulators/BizHawk/issues/711)
+
+@<!---->twarnercool2:
+- [#575](https://github.com/TASEmulators/BizHawk/issues/575)
+
+Unidentified:
+- TODO
+
+Potential sources for usernames:
+- mentions from other users (esp. via email)
+- Internet Archive
+- IRC logs