Remove STATE_SLEEP, that is not an actual state.
Stylefix.
Fix showing double next.
Use gflags for WNEXT.
Remove ZENKESI_BONUS which is defined in FieldRealtime.

We should use one defined in core/constant.h
Remove constants which is not used.
Stylefix.
Stylefix.
Rename FieldRealtime::Play to FieldRealtime::PlayOneFrame

so that this methold should run 1 frame.
Handle KEY_UP.

though anything does not happen when KEY_UP is pressed.