PlayerNumber is a simple, regular data structure, and is depended on

by lower level things (eg. InputMapper).  However, concepts like
"joined players" and "human players" is a high-level, GAMESTATE
concept, and engine stuff shouldn't depend on that.  Move the
GameState-depending stuff into GameState.  Move
IsAnyPlayerUsingMemoryCard as well (and rename to HumanPlayer),
to fix MemoryCardManager dep.

stepmania/src/GameState.cpp

@@ -1787,6 +1787,48 @@ Profile* GameState::GetEditLocalProfile()
 }
 
 
+PlayerNumber GetNextHumanPlayer( PlayerNumber pn )
+{
+	for( enum_add(pn, 1); pn < NUM_PLAYERS; enum_add(pn, 1) )
+		if( GAMESTATE->IsHumanPlayer(pn) )
+			return pn;
+	return PLAYER_INVALID;
+}
+
+PlayerNumber GetNextEnabledPlayer( PlayerNumber pn )
+{
+	for( enum_add(pn, 1); pn < NUM_PLAYERS; enum_add(pn, 1) )
+		if( GAMESTATE->IsPlayerEnabled(pn) )
+			return pn;
+	return PLAYER_INVALID;
+}
+
+PlayerNumber GetNextCpuPlayer( PlayerNumber pn )
+{
+	for( enum_add(pn, 1); pn < NUM_PLAYERS; enum_add(pn, 1) )
+		if( GAMESTATE->IsCpuPlayer(pn) )
+			return pn;
+	return PLAYER_INVALID;
+}
+
+PlayerNumber GetNextPotentialCpuPlayer( PlayerNumber pn )
+{
+	for( enum_add(pn, 1); pn < NUM_PLAYERS; enum_add(pn, 1) )
+		if( !GAMESTATE->IsHumanPlayer(pn) )
+			return pn;
+	return PLAYER_INVALID;
+}
+
+MultiPlayer GetNextEnabledMultiPlayer( MultiPlayer mp )
+{
+	for( enum_add(mp, 1); mp < NUM_MultiPlayer; enum_add(mp, 1) )
+		if( GAMESTATE->IsMultiPlayerEnabled(mp) )
+			return mp;
+	return MultiPlayer_Invalid;
+}
+
+
+
 // lua start
 #include "LuaBinding.h"
 #include "Game.h"
@@ -2024,6 +2066,17 @@ public:
 		pStyle->PushSelf( L );
 		return 1;
 	}
+	static int IsAnyHumanPlayerUsingMemoryCard( T* p, lua_State *L )
+	{
+		bool bUsingMemoryCard = false;
+		FOREACH_HumanPlayer( pn )
+		{
+			if( MEMCARDMAN->GetCardState(pn) == MemoryCardState_Ready )
+				bUsingMemoryCard = true;
+		}
+		lua_pushboolean(L, bUsingMemoryCard );
+		return 1;
+	}
 		
 	LunaGameState() 
 	{
@@ -2096,6 +2149,7 @@ public:
 		ADD_METHOD( GetHumanPlayers );
 		ADD_METHOD( SetSongOptions );
 		ADD_METHOD( GetCurrentStyle );
+		ADD_METHOD( IsAnyHumanPlayerUsingMemoryCard );
 	}
 };