Add IgnoreAboveGroundPlayers option to TriggerRadiation, uses the IsUnderground check on BaseEntity which won't work in some cases (like noclipping under the terrain). It's what we use for the equivalent check on the puzzle reset
If a PuzzleReset is set to ignoreAboveGroundPlayers it will now pass that along to it's radiation zone
Airfield will now ignore above ground players
Puzzles will now start counting time spent empty with rads active once any radiation is active, not just once radiation is fully activated
Don't send the puzzle reset warnings to players that are above ground on a monument set to ignore above ground players