ENGINES: Introduce method Engine::initializePath which sets up SearchMan.

This replaces the hardcoded addition of the game path in runGame in
base/main.cpp by an engine configurable one.

base/main.cpp

@@ -197,7 +197,7 @@ static Common::Error runGame(const EnginePlugin *plugin, OSystem &system, const
 	//
 
 	// Add the game path to the directory search list
-	SearchMan.addDirectory(dir.getPath(), dir, 0, 4);
+	engine->initializePath(dir);
 
 	// Add extrapath (if any) to the directory search list
 	if (ConfMan.hasKey("extrapath")) {

engines/engine.cpp

@@ -154,6 +154,10 @@ Engine::~Engine() {
 	CursorMan.popCursorPalette();
 }
 
+void Engine::initializePath(const Common::FSNode &gamePath) {
+	SearchMan.addDirectory(gamePath.getPath(), gamePath, 0, 4);
+}
+
 void initCommonGFX(bool defaultTo1XScaler) {
 	const Common::ConfigManager::Domain *transientDomain = ConfMan.getDomain(Common::ConfigManager::kTransientDomain);
 	const Common::ConfigManager::Domain *gameDomain = ConfMan.getActiveDomain();

engines/engine.h

@@ -37,6 +37,7 @@ class Error;
 class EventManager;
 class SaveFileManager;
 class TimerManager;
+class FSNode;
 }
 namespace GUI {
 class Debugger;
@@ -141,6 +142,16 @@ public:
 	Engine(OSystem *syst);
 	virtual ~Engine();
 
+	/**
+	 * Init SearchMan according to the game path.
+	 *
+	 * By default it adds the directory in non-flat mode with a depth of 4 as
+	 * priority 0 to SearchMan.
+	 *
+	 * @param gamePath The base directory of the game data.
+	 */
+	virtual void initializePath(const Common::FSNode &gamePath);
+
 	/**
 	 * Init the engine and start its main loop.
 	 * @return returns kNoError on success, else an error code.