Speed up reading multiple isos in a row.

Core/FileSystems/ISOFileSystem.h

@@ -19,6 +19,7 @@
 
 #include <map>
 #include <string>
+#include <list>
 
 #include "FileSystem.h"
 
@@ -53,7 +54,7 @@ private:
 		~TreeEntry()
 		{
 			for (unsigned int i=0; i<children.size(); i++)
-				delete children[i];
+				ISOFileSystem::ReleaseTreeEntry(children[i]);
 			children.clear();
 		}
 
@@ -89,4 +90,8 @@ private:
 	void ReadDirectory(u32 startsector, u32 dirsize, TreeEntry *root);
 	TreeEntry *GetFromPath(std::string path, bool catchError=true);
 	std::string EntryFullPath(TreeEntry *e);
+
+	static std::list<ISOFileSystem::TreeEntry *> entryFreeList;
+	static TreeEntry *GetTreeEntry();
+	static void ReleaseTreeEntry(TreeEntry *entry);
 };