Set creation/modification time of volume on root

[qistoph]

Would you consider setting the creation and/or modification time attributes of the root "/" of the LittleFS to the timestamp of volume creation?

This PR adds:

• actionPack: setting the attributes 't' and 'c' to the time of build
• actionList: showing the creation time on list -l

Example output (diff):

 $ mklittlefs -p 256 -b 8192 -s 1024000 -l littlefs.bin
 5247    /client.js      Tue Dec 15 13:10:41 2020
 1747    /index.htm      Tue Dec 15 11:39:46 2020
 89476   /jquery-3.5.1.min.js    Mon May  4 23:02:39 2020
 71      /style.css      Fri Jul 17 13:57:50 2020
+Creation time:  Wed Feb 10 18:21:19 2021

[earlephilhower]

Seems good, thanks!

I assume you're using something other than the ESP8266 LittleFS implementation? Because the core doesn't know about these tags and doesn't support getting date/time on Dirs AFAIR...

[qistoph]

I assume you're using something other than the ESP8266 LittleFS implementation? Because the core doesn't know about these tags and doesn't support getting date/time on Dirs AFAIR...

That's going to be my next PR. Working out the details...

[earlephilhower]

Ah, good. A new full toolchain build will be needed to get this into the core, but in the meantime you can manually build and install this version for your coding.