Changed the Gecko code handling to the native code handler. This provides full compatibility with all Gecko codes.

To use the native code handler, place the kenobiwii.bin file into the Sys directory.  Dolphin will silently fall-back to the emulated code handler if the file is not there.

Fixes issue 4561.

Source/Core/Common/Src/CommonPaths.h

@@ -126,6 +126,8 @@
 #define WII_USA_SETTING "setting-usa.txt"
 #define WII_JAP_SETTING "setting-jpn.txt"
 
+#define GECKO_CODE_HANDLER "kenobiwii.bin"
+
 // Subdirs in Sys
 #define GC_SYS_DIR "GC"
 #define WII_SYS_DIR "Wii"