Support 2nd Disk][ card and improved card management (#726) (PR #741)

Support 2nd Disk][ in slot-5, via command line:
- -s5 diskii
- -s5d1 \<imagefile\>
- -s5d2 \<imagefile\>

NB. there's currently no Configuration UI support, except the Drive icons' tooltips show what's in slot-5 & slot-6 (for drive-n). So there's no way to eject the disks or insert new disks. The use-case I'm supporting it Wasteland which just has the 4 disks in the 4 drives.

Improved card management:
- Added `class Card` (in Card.h) which all other cards (that exist as classes) derive from (eg. LC,SSC,Mouse,Disk2).
- Added `class CardManager` (in CardManager.cpp\h) which now manages the 8 slots (and aux slot).
- Added `class Disk2CardManager` (in Disk2CardManager.cpp\h) which provides methods for operations that act on all Disk2 instances at the same time.
- Currently limited to just 1x SSC and 1x Mouse card (why would you need more?). This simplifies things, meaning there's no need to have dedicated SSCManager / MouseCardManager objects.
- Currently the 2nd Disk2 card can only be put into slot-5. This limitation is just due to the complexity of the Configuration UI. Having a more general drop-down per slot UI would remove this limitation.

source/CPU.cpp

@@ -87,6 +87,7 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 #include "StdAfx.h"
 
 #include "Applewin.h"
+#include "CardManager.h"
 #include "CPU.h"
 #include "Frame.h"
 #include "Memory.h"
@@ -145,6 +146,8 @@ static volatile BOOL g_bNmiFlank = FALSE; // Positive going flank on NMI line
 
 static bool g_irqDefer1Opcode = false;
 
+static bool g_isMouseCardInstalled = false;
+
 //
 
 static eCpuType g_MainCPU = CPU_65C02;
@@ -200,6 +203,11 @@ void ResetCyclesExecutedForDebugger(void)
 	g_nCyclesExecuted = 0;
 }
 
+void SetMouseCardInstalled(bool installed)
+{
+	g_isMouseCardInstalled = installed;
+}
+
 //
 
 #include "CPU/cpu_general.inl"
@@ -455,8 +463,8 @@ static __forceinline void CheckInterruptSources(ULONG uExecutedCycles, const boo
 	if (MB_UpdateCycles(uExecutedCycles))
 		g_irqOnLastOpcodeCycle = true;
 
-	if (sg_Mouse.IsActive())
-		sg_Mouse.SetVBlank( !VideoGetVblBar(uExecutedCycles) );
+	if (g_isMouseCardInstalled)
+		g_CardMgr.GetMouseCard()->SetVBlank( !VideoGetVblBar(uExecutedCycles) );
 }
 
 // GH#608: IRQ needs to occur within 17 cycles (6 opcodes) of configuring the timer interrupt