Controller performs NTP check on startup (and every 5 minutes)
which determines whether block generation is allowed.
System Tray tooltip updated to reflect generating status.
Plus new translations.
Improved GuiTests.
BlockGenerator fetches forging accounts first, and sleeps
if none configured, which is less work than processing peer lists.
Now uses several NTP servers to determine mean offset from
system clock to internet time.
If abs(offset) > 500ms or NTP service not running then
user is 'nagged' via system tray pop-up notification
with instructions on how to fix.
Also improved system tray translations!
SysTray pop-up menu now includes entry for launching https://time.is
so node owners can check their system clocks against internet time.
Windows installs also have additional systray menu entry which
runs ntpcfg.bat script, included in resources.
Also available as download via node-UI servlet,
e.g. http://localhost:9880/downloads/ntpcfg.bat
ntpcfg.bat reconfigures Windows Time Service with many NTP servers,
restarts the service, and also makes sure it auto-starts on boot.
Added DEBUG-level logging when rejecting nodes due to excessive
time difference (during PROOF handshake stage).
Bumped default settings values for minOutboundPeers from 10 to 20.
Bumped default settings values for maxPeers from 30 to 50.
