Introduce Path, start using it all over the place.

Still lots left to convert!

Convert GetSysDirectory to return Path.

More buildfixing

Remove unnecessary Path( constructors

Core/FileSystems/VirtualDiscFileSystem.h

@@ -21,6 +21,7 @@
 
 #include <map>
 
+#include "Common/File/Path.h"
 #include "Core/FileSystems/FileSystem.h"
 #include "Core/FileSystems/DirectoryFileSystem.h"
 
@@ -39,7 +40,7 @@ public:
 	bool     OwnsHandle(u32 handle) override;
 	int      Ioctl(u32 handle, u32 cmd, u32 indataPtr, u32 inlen, u32 outdataPtr, u32 outlen, int &usec) override;
 	PSPDevType DevType(u32 handle) override;
-	bool GetHostPath(const std::string &inpath, std::string &outpath) override;
+	bool GetHostPath(const std::string &inpath, Path &outpath) override;
 	std::vector<PSPFileInfo> GetDirListing(std::string path) override;
 	FileSystemFlags Flags() override { return FileSystemFlags::UMD; }
 	u64  FreeSpace(const std::string &path) override { return 0; }
@@ -57,7 +58,7 @@ private:
 	// Warning: modifies input string.
 	int getFileListIndex(std::string &fileName);
 	int getFileListIndex(u32 accessBlock, u32 accessSize, bool blockMode = false);
-	std::string GetLocalPath(std::string localpath);
+	Path GetLocalPath(std::string localpath);
 
 	typedef void *HandlerLibrary;
 	typedef int HandlerHandle;
@@ -99,7 +100,7 @@ private:
 		HandlerFileHandle(Handler *handler_) : handler(handler_), handle(-1) {
 		}
 
-		bool Open(std::string& basePath, std::string& fileName, FileAccess access) {
+		bool Open(const std::string& basePath, const std::string& fileName, FileAccess access) {
 			// Ignore access, read only.
 			handle = handler->Open(basePath.c_str(), fileName.c_str());
 			return handle > 0;
@@ -135,11 +136,11 @@ private:
 		u64 startOffset;	// only used by lbn files
 		u64 size;			// only used by lbn files
 
-		bool Open(std::string& basePath, std::string& fileName, FileAccess access) {
+		bool Open(const Path &basePath, std::string& fileName, FileAccess access) {
 			// Ignored, we're read only.
 			u32 err;
 			if (handler.IsValid()) {
-				return handler.Open(basePath, fileName, access);
+				return handler.Open(basePath.ToString(), fileName, access);
 			} else {
 				return hFile.Open(basePath, fileName, access, err);
 			}
@@ -170,7 +171,7 @@ private:
 	typedef std::map<u32, OpenFileEntry> EntryMap;
 	EntryMap entries;
 	IHandleAllocator *hAlloc;
-	std::string basePath;
+	Path basePath;
 
 	struct FileListEntry {
 		std::string fileName;