3ds: Port refactor.

This commit does the following changes to the 3ds port:

- Rename the target from ctru to 3ds.
- Rename all files and functions with the ctru naming convention to 3ds.
- Created a new file and folder structure that will better integrate future console ports that share the same codebase.
- Fixed a buffer overflow bug in pcm code.

Change-Id: I17c6f86df64eb99dd2b653485d70832ff46b2ba8

firmware/include/dir.h

@@ -27,8 +27,8 @@
 #include "fs_attr.h"
 #include "fs_defines.h"
 
-#if defined(CTRU) && !defined(SIMULATOR)
-#include "filesystem-ctru.h"
+#if (CONFIG_PLATFORM & PLATFORM_GAME_CONSOLE) && !defined(SIMULATOR)
+#include "filesystem-console.h"
 #elif defined (APPLICATION) || defined(CHECKWPS)
 #include "filesystem-app.h"
 #elif defined(SIMULATOR) || defined(DBTOOL)

firmware/include/file.h

@@ -39,8 +39,8 @@ enum relate_result
     RELATE_PREFIX,        /* the path2 contains path1 as a prefix */
 };
 
-#if defined(CTRU) && !defined(SIMULATOR)
-#include "filesystem-ctru.h"
+#if (CONFIG_PLATFORM & PLATFORM_GAME_CONSOLE) && !defined(SIMULATOR)
+#include "filesystem-console.h"
 #elif defined(APPLICATION) || defined(CHECKWPS)
 #include "filesystem-app.h"
 #elif defined(SIMULATOR) || defined(DBTOOL)

firmware/include/rbendian.h

@@ -27,7 +27,7 @@
 #endif
 
 #ifndef __MINGW32__
-#if defined(__APPLE__) || defined(CTRU)
+#if defined(__APPLE__) || defined(N3DS)
 #include <sys/types.h>
 #else
 #include <endian.h>