v0.1.2: Update SimpleLoader

Sample menu application has been updated and fixed some bugs.

• Fix the bug that the TF card is not detected after running some applications which uses DMAC like LovyanGFX.
• Fix the bug that SimpleLoader can not launch the application after writing it to internal flash.

Update SimpleLoader

Sample menu application has been updated and fixed some bugs.

v0.1.0: Initial release

Initial release of ExtFlashLoader