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Allow backend to specify data folder

On the 3DS, I want the data files to go in the read-only ROMFS, while
save data goes on the SD card. This is impossible with the current
system, so I'm changing it.

The other backends will need updating to support this.

--- a/src/Backends/Misc.h

+++ b/src/Backends/Misc.h

@@ -89,7 +89,7 @@

 bool Backend_Init(void (*drag_and_drop_callback)(const char *path), void (*window_focus_callback)(bool focus));

 void Backend_Deinit(void);

 void Backend_PostWindowCreation(void);

-bool Backend_GetBasePath(std::string *string_buffer);

+bool Backend_GetPaths(std::string *module_path, std::string *data_path);

 void Backend_HideMouse(void);

 void Backend_SetWindowIcon(const unsigned char *rgb_pixels, size_t width, size_t height);

 void Backend_SetCursor(const unsigned char *rgba_pixels, size_t width, size_t height);

--- a/src/Backends/Platform/3DS.cpp

+++ b/src/Backends/Platform/3DS.cpp

@@ -5,6 +5,9 @@

 #include <string.h>

 #include <string>

+#include <sys/stat.h>

+#include <sys/types.h>

+

 #include <3ds.h>

 bool Backend_Init(void (*drag_and_drop_callback)(const char *path), void (*window_focus_callback)(bool focus))

@@ -45,9 +48,17 @@

 	// Nothing to do here

 }

-bool Backend_GetBasePath(std::string *string_buffer)

+bool Backend_GetPaths(std::string *module_path, std::string *data_path)

 {

-	*string_buffer = "romfs:";

+	// Create the CSE2 folder if it doesn't already exist

+	mkdir("sdmc:/3ds", 0777);

+	mkdir("sdmc:/3ds/cse2", 0777);

+

+	// Configuration files and save data goes on the read-write SD card

+	*module_path = "sdmc:/3ds/cse2";

+

+	// Data goes in the read-only ROMFS

+	*data_path = "romfs:";

 	return true;

 }

--- a/src/Main.cpp

+++ b/src/Main.cpp

@@ -106,8 +106,8 @@

 	if (!Backend_Init(DragAndDropCallback, WindowFocusCallback))

 		return EXIT_FAILURE;

-	// Get executable's path

-	if (!Backend_GetBasePath(&gModulePath))

+	// Get executable's path, and path of the data folder

+	if (!Backend_GetPaths(&gModulePath, &gDataPath))

 	{

 		// Fall back on argv[0] if the backend cannot provide a path

 		gModulePath = argv[0];

@@ -120,10 +120,9 @@

 				break;

 			}

 		}

-	}

-	// Get path of the data folder

-	gDataPath = gModulePath + "/data";

+		gDataPath = gModulePath + "/data";

+	}

 	CONFIGDATA conf;

 	if (!LoadConfigData(&conf))