New GoAround mode

Changed from descent and climb to altitude cycles algorithm and added
new test with files.
KPV for runway available to reject at V1

This is a draft KPV, added following the EOFDM conference where Emirates
suggested monitoring the runway distance available at 1 second before
V1. Still draft as V1 is not available on most types, and we are in
debate about the units of this KPV (see blog on flightdatacommunity.com)
GA & ILS improvements

Multiple go-arounds now don't overlap when extending towards 3000ft
initial altitude.
ILS ignores poor signals with <80% valid data.
ILS test included, but GA test not yet added. Will need to de-identify
the test case as it's obvious who it is!