Hotfix 2.1.20

PERF: Clicking the empty space caused lags when there were many upcoming trains
PERF: Station Panel optimized to handle many panels with many trains

FIX: Game crashed when transport demand was fulfilled for the first time by accepting / modifying a contract (corner case)
FIX: Happy passenger score panel was not being shown on activating happy passenger on a saved map from the cheat window
FIX: Long-haul transport demand itineraries allowed disembarking from a non-stop train
FIX: Passenger icons where placed incorrectly when platform has multiple bends in it
FIX: Wait for fetch of workshop maps from steam before attempting to load latest save if it is workshop map save

Note: Version 2.1.19 contained a bug and was skipped.