Fix sendcommand function to set as GET instead as POST as new ESP core
is less permissive and do not take GET argument in POST request anymore
change FW version for tracking
Allows navigation as normal Filesystem
add /delete directory
parse directory tree
allows user to upload/delete in /user directory only when admin has full
access
admin is for wifi / esp settings
user is for printer settings
admin and user ID can be defined in config.h
[ESP555]<admin password> allows to reset user password to default one
Separate M20 command from file listing to give time to get the complete
file list before sending the list
Change SDK function system_get_time and wifi_get_opmode to use wrapper
ones and avoid to include user_interface.h if not necessary
