Add LCDPROC NTP Screen

[elvisimprsntr]

Requested updates from @jim-p

Original work by @georou

https://redmine.pfsense.org/issues/14625

[jim-p]

Testing this out a couple things seem less than ideal:

1. The screen has no label so it's not obvious what it is. At least printing "NTP: " before the IP address would be helpful
2. The "(stratum n)" wastes a ton of space on something I'm not sure is significant and it obscures the IP address more often than not. "Stratum" could be abbreviated to "St" maybe or omitted entirely. It would be even worse for an IPv6 address
3. There is quite a bit of dead space after the Delay/Offset/Jitter labels, though I'm not sure anything can be done for that. The numbers might be able to fit on a single line going horizontally on two lines instead of three. Like we do for the system stats or UPS info. That would free up a whole line to print the Title/IP address and stratum info separately.

[elvisimprsntr]

@jim-p @georou

1,2. Displaying the sync source on a single line is consistent with the web interface. There will never be enough characters to display the reference, so scrolling the row might be the only option.

3. Problem is the delay, offset, and jitter are in msec. So if someone is not using a GPS or PPS, the values can be very large. We would have to truncate the number of characters.

Perhaps something like this?

LCD Display Generator: http://avtanski.net/projects/lcd/

Or one of the following

I'm leaning towards the last one. Let me know what you both think?