writeNBT

readNBT - is NBT value present i..e contains rider

Contain some checks for common functionality:
do NOT create helpers for methods that can be called on the ENTITY ITSELF as those will actually be STABLE

• isRidden
• isWItherSkeleton (does this need NBT?)
• hasSaddle
• eaten / love

can readNBT apply to player in range as well? (eg scoreboard data)