Remove unnecessary onPose functions

Only the onPose(myo::Myo*, uint64_t, myo::Pose) functions are removed as
they do not do anything but call
BaseClass::onPose(myo::Myo*, uint64_t, myo::Pose) which is unnecessary.
This would only be necessary if that class needed access to the raw
poses.
Remove unnecessary onPeriodic functions

It is not necessary to have an onPeriodic function in every class unless
that class needs does things other than call BaseClass::onPeriodic