Persistent Coins (#1405)

On Coin Insert, a file Save/Coin.ini is created if it does not exist, which stores the number of coins currrently in m_iCoins. Whenever m_iCoins is update, the Coin.ini is updated.

On boot, Coin.ini is read and m_iCoins is set to that value. If coins in coin.ini file is greater then MAX_NUM_CREDITS then reset the value to 0.

src/StepMania.cpp

@@ -1281,9 +1281,12 @@ void StepMania::InsertCoin( int iNum, bool bCountInBookkeeping )
 	{
 		GAMESTATE->m_iCoins.Set( MAX_NUM_CREDITS * PREFSMAN->m_iCoinsPerCredit );
 	}
-	
+
 	LOG->Trace("%i coins inserted, %i needed to play", GAMESTATE->m_iCoins.Get(), PREFSMAN->m_iCoinsPerCredit.Get() );
 
+    // On InsertCoin, make sure to update Coins file
+    BOOKKEEPER->WriteCoinsFile(GAMESTATE->m_iCoins.Get());
+
 	// If inserting coins, play an appropriate sound; if deducting coins, don't play anything.
 	if (iNum > 0)
 	{
@@ -1323,6 +1326,9 @@ void StepMania::ClearCredits()
 	GAMESTATE->m_iCoins.Set( 0 );
 	SCREENMAN->PlayInvalidSound();
 
+    // Update Coins file to make sure credits are cleared.
+    BOOKKEEPER->WriteCoinsFile(GAMESTATE->m_iCoins.Get());
+
 	// TODO: remove this redundant message and things that depend on it
 	Message msg( "CoinInserted" );
 	// below params are unused