Full implementation of the local solar time complication using the
pveducation.org formula set (LSTM, B, EoT, TC, LST, HRA). EoT and TC
are cached by day-of-year and recomputed once at midnight rollover.
Three display modes cycle with the Alarm button:
SO HH:MM:SS — Local Solar Time
nO HH:MM — Solar Noon in local clock time
Hr ±DDD — Hour Angle in degrees
Location is read from location.u32 on the filesystem. In the simulator
the browser lat/lon globals are written to location.u32 on activation
if not already set, fixing the "no Loc" issue in the emulator.
Raffael Mancini