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* Add time to filesystem API Support the ESP32 File::getLastWrite() call and setting the time on all filesystems automatically (assuming the system clock has been set properly and time(NULL) returns the proper time!). Adds Dir::fileTime() to get the time of a file being listed, similar to Dir::fileName() and Dir::fileSize(). Adds ::setTimeCallback(time_t (*cb)()) to File, Dir, and FS, allowing users to override the default timestamp on a per-file, directory, or filesystem basis. By default, a simple callback returning time(nullptr) is implemented. LittleFS uses the 't' attribute and should be backwards compatible. SD/SDFS work and include wrappers for obsolete SdFat timestamp callbacks using the MSDOS time. This PR does not update SPIFFS, due to compatability concerns and a possible massive rewrite which would make it possible to determine if an old-style ot metadata enabled FS is present at mount time. Includes an updated SD/listfiles and LittleFS_time example. Replaces #6315 * Add links to new mklittlefs w/timestamp support Include the update mklittlefs which generated 't' metadata on imported files. ../tools/sdk/lwip2/include/netif/lowpan6_opts.h * Add explicit note about timestamp being local time * Address review concerns Clean up some awkward object instantiations. Remove the _enableTime flag/setter from SPIFFS. Clean up the FSConfig constructors using C++ style init lists.