ENGINES: Add a helper method - getMetaEngineConnect().

- Get a metaEngine plugin by querying the ConfMan.
- Next, use this MetaEngine to find a matching enginePlugin.
- Return the enginePlugin.

engines/engine.cpp

@@ -871,6 +871,16 @@ MetaEngine &Engine::getMetaEngine() {
 	return plugin->get<MetaEngine>();
 }
 
+MetaEngineConnect &Engine::getMetaEngineConnect() {
+	const Plugin *metaEnginePlugin = EngineMan.findPlugin(ConfMan.get("engineid"));
+	assert(metaEnginePlugin);
+
+	const Plugin *enginePlugin = PluginMan.giveEngineFromMetaEngine(metaEnginePlugin);
+	assert(enginePlugin);
+
+	return enginePlugin->get<MetaEngineConnect>();
+}
+
 PauseToken::PauseToken() : _engine(nullptr) {}
 
 PauseToken::PauseToken(Engine *engine) : _engine(engine) {}

engines/engine.h

@@ -32,6 +32,7 @@
 
 class OSystem;
 class MetaEngine;
+class MetaEngineConnect;
 
 namespace Audio {
 class Mixer;
@@ -379,6 +380,7 @@ public:
 	static bool shouldQuit();
 
 	static MetaEngine &getMetaEngine();
+	static MetaEngineConnect &getMetaEngineConnect();
 
 	/**
 	 * Pause the engine. This should stop any audio playback