[Removed] redundant method for checking if a player is riding a
mount/vehicle
[Renamed] isRidingCreature to hasRidingCreature for clarity (it checks
if the object is being ridden)
[Removed] several unnecessary checks (since players cannot be ridden)

Change-Id: I86e4e6986713522a6b2eb010724c208510828251
Merge "[Removed] redundant method for checking if a player is riding a mount/vehicle [Renamed] isRidingCreature to hasRidingCreature for clarity (it checks if the object is being ridden) [Removed] several unnecessary checks (since players cannot be ridden)" into unstable