Lots of changes/new features

- To override the last used boot mode on soft reboot, you only need to press A if you want to boot to the default option. Holding L(+payload button)/R is enough for the other modes.
- Added version number to the config menu
- Replaced the memsearch algorithm with a faster one
- Integrated 3ds_injector from @yifanlu. This brings us region free and all the other FreeMultiPatcher patches. Other than that, you now have the possibility to display the currently booted NAND/FIRM in System Settings!
- Rewritten most code for the config menu. You now can navigate to the first/last options with left and right.
- You can now choose the 9.0 FIRM to be default in the config menu. This will essentially switch "no buttons" and L in both modes.
- You can now choose the second emuNAND to be default in the config menu. This will essentially switch "B is not pressed" and "B is pressed".
- When the second emuNAND is booted, it will persist like the other boot options on soft reboot
- Bugfixes

injector/source/ifile.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include <3ds/types.h>
+
+typedef struct
+{
+  Handle handle;
+  u64 pos;
+  u64 size;
+} IFile;
+
+Result IFile_Open(IFile *file, FS_Archive archive, FS_Path path, u32 flags);
+Result IFile_Close(IFile *file);
+Result IFile_GetSize(IFile *file, u64 *size);
+Result IFile_Read(IFile *file, u64 *total, void *buffer, u32 len);
+Result IFile_Write(IFile *file, u64 *total, void *buffer, u32 len, u32 flags);