Add an engine "compatible" version

When a patch version is released, it must declare compatibility with the
previous patch versions of the same main release. This allows players to
keep replaying their games and to keep playing online with users of
other patches of the same main release.

This should have anticipated for dae7a8c394

source/ps/Replay.cpp

@@ -80,7 +80,7 @@ void CReplayLogger::StartGame(JS::MutableHandleValue attribs)
 	Script::SetProperty(rq, attribs, "timestamp", (double)std::time(nullptr));
 
 	// Add engine version and currently loaded mods for sanity checks when replaying
-	Script::SetProperty(rq, attribs, "engine_version", PYROGENESIS_VERSION);
+	Script::SetProperty(rq, attribs, "engine_serialization_version", PS_SERIALIZATION_VERSION);
 	JS::RootedValue mods(rq.cx);
 	Script::ToJSVal(rq, &mods, g_Mods.GetEnabledModsData());
 	Script::SetProperty(rq, attribs, "mods", mods);