- fix ntp module. auto reconnect only when wlan is available again
- network manager module for "known network settings" added.
to switch **manually** between networks without entering the password again.
switching the network only works from soft-ap since the assigned (new) ip-address will be different.
the default ip and url with soft-ap is `http://192.168.4.1/admin/wlan`.
the known network login info (ssid,password) is stored in a separate file in folder `/etc/network`.
the mac of the wlan is used to build the filename since the ssid as such might be available
also at different locations (but with a different password).
- the admin wlan module under url `http://your-ip/admin/wlan` has now an additional col "known"
to indicate that it is a known network (identified by mac address)
- the file `wlan.cfg` can contain now 3 lines with:
ssid
password
mac
- where the last line with mac address is optional, but of course will be set automatically
when using the wlan admin tool.
- all above will not remove the `wlan.cfg` file or disable a currently set up wlan connection.
- fix in simplicity `simple_esc_html()`
-