Just to be extra pedantic and to get an error while developing on
InfiniSim. Because on PC we can easily add the debugger, on the device
we can, but it is a bit more involved.
The external SPI flash is implemented as a 4MB on the local filesystem.
This allows the FS (littleFS) and settings to work properly.
Remove the simulated `FS.h` and `FS.cpp`, because we can now use
the files from InfiniTime directly as the heavy lifting is done in the simulated
`SpiNorFlash.h` and cpp files.
`SpiNorFlash.h` provides read and write functions with `uint8_t` buffer, but
`fs::fstream` expects `char` buffer. Use `reinterpret_cast` and check if by
any chance the `char` type on a platform is implemented with more
than one byte. Then the `reinterpret_cast<char *>(buffer)` would change the
meaning of the `size` parameter, which could lead to garbage data.
Co-authored-by: Reinhold Gschweicher <pyro4hell@gmail.com>
