Misleading variable names

[Aki]

The methods that create size oriented Pickle/UnpickleStates have wrong names.

boopickle/boopickle/shared/src/main/scala/boopickle/Pickler.scala

Line 529 in dfeadd4

 implicit def pickleStateSpeed: PickleState = new PickleState(new EncoderSize, true, true) 

boopickle/boopickle/shared/src/main/scala/boopickle/Pickler.scala

Line 596 in dfeadd4

 implicit def unpickleStateSpeed: ByteBuffer => UnpickleState = bytes => new UnpickleState(new DecoderSize(bytes), true, true)