OP-1290 fixes in telemetry (and pios_board initialization)
OP-1290 uncommented accidentally commented lines
OP-1290 fix event system issues caused by alarm flapping
OP-1290 saved some RAM by removing last alarm update time from UAVObject

(static allocated array instead, and smaller element size)
OP-1290 added nicer #define for magic number
OP1290 Systemalarms optimizations as suggested by OPReview-689
drive-by bugfix in Fixedwingpathfollower
Merge branch 'corvuscorax/OP-1290_telemetry_fixes' into next