Deprecation of SPIFFS in favour of littleFS

[networkfusion]

Mark SPIFFS as deprecated (still an option in firmware, although not selected by default) and use littleFS instead. see esp8266/Arduino#7263 for some good reasons why.

[josesimoes]

Link to the littleFS

[josesimoes]

Here's the results of a direct comparison between the two file systems: RIOT-OS/RIOT#8316

[networkfusion]

Work on this can be found here: https://github.com/nanoframework/nf-interpreter/tree/develop-littlefs

[networkfusion]

Note that chibiOS 20.3.x also supports EFlash subsystem (EFL) http://www.chibios.com/forum/viewtopic.php?f=3&t=4323&sid=15a7802a3245dccb6fe93526752e422a&start=40

[stale]

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