rewrite-sw, unify CKTstates[] access

do it the same way as the other devices do

access CKTstates[] via CKTstate0 CKTstate1 macros
access device "slots" via descriptive macros

src/spicelib/devices/csw/cswdefs.h

@@ -58,6 +58,10 @@ typedef struct sCSWinstance {
 #define CSW_OFF_CONDUCTANCE ckt->CKTgmin   /* default off conductance */
 #define CSW_NUM_STATES 2
 
+#define CSWswitchstate CSWstate+0
+#define CSWctrlvalue   CSWstate+1
+
+
 typedef struct sCSWmodel {      /* model structure for a switch */
 
     struct GENmodel gen;

src/spicelib/devices/sw/swdefs.h

@@ -57,6 +57,10 @@ typedef struct sSWinstance {
 #define SW_OFF_CONDUCTANCE ckt->CKTgmin   /* default off conductance */
 #define SW_NUM_STATES 2
 
+#define SWswitchstate SWstate+0
+#define SWctrlvalue   SWstate+1
+
+
 typedef struct sSWmodel {      /* model structure for a switch */
 
     struct GENmodel gen;