Add private MEV embedded support

src/mev.nim

@@ -0,0 +1,13 @@
+import ./offline_data
+
+when hasEmbeddedTranslationData("mev"):
+  import ./embedded_bible
+
+  const mevRows = embeddedTranslationData("mev")
+
+proc fetchPassages*(reference: string): seq[string] =
+  when hasEmbeddedTranslationData("mev"):
+    embedded_bible.fetchPassages(mevRows, reference, "MEV")
+  else:
+    raise newException(ValueError,
+      "MEV data is not embedded; generate data/private/mev.tsv and rebuild")