Redo file prompts with in-game UI

PortabilityLayer/FileBrowserUI.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include "VirtualDirectory.h"
+
+class PLPasStr;
+
+namespace PortabilityLayer
+{
+	class FileBrowserUI
+	{
+	public:
+		enum Mode
+		{
+			Mode_Save,
+			Mode_Open,
+		};
+
+		static bool Prompt(Mode mode, VirtualDirectory_t dirID, char *path, size_t &outPathLength, size_t pathCapacity, const PLPasStr &initialFileName, const PLPasStr &promptText);
+	};
+}