feat: customisable switch generated source groups (#5016)

Co-authored-by: elecpower <neilh713@tpg.com.au>

companion/src/firmwares/rawsource.cpp

@@ -22,6 +22,7 @@
 
 #include "eeprominterface.h"
 #include "radiodata.h"
+#include "modeldata.h"
 #include "radiodataconversionstate.h"
 
 #include <float.h>
@@ -255,6 +256,9 @@ QString RawSource::toString(const ModelData * model, const GeneralSettings * con
     case SOURCE_TYPE_SPACEMOUSE:
       return tr("sm%1").arg(QChar('A' + (index - 1)));
 
+    case SOURCE_TYPE_FUNCTIONSWITCH_GROUP:
+      return tr("GR%1").arg(index);
+
     default:
       return QString(CPN_STR_UNKNOWN_ITEM);
   }
@@ -284,9 +288,14 @@ bool RawSource::isAvailable(const ModelData * const model, const GeneralSettings
   if (type == SOURCE_TYPE_CH && abs(index) > CPN_MAX_CHNOUT)
     return false;
 
+  if (type == SOURCE_TYPE_FUNCTIONSWITCH_GROUP && index >= b.getCapability(Board::FunctionSwitches))
+    return false;
+
   if (type == SOURCE_TYPE_CUSTOM_SWITCH && abs(index) > CPN_MAX_LOGICAL_SWITCHES)
     return false;
 
+  if (type == SOURCE_TYPE_FUNCTIONSWITCH_GROUP && model->getFuncGroupSwitchCount(abs(index), CPN_MAX_SWITCHES_FUNCTION) == 0)
+    return false;
 
   if (type == SOURCE_TYPE_LUA_OUTPUT && div(abs(index - 1), 16).quot >= CPN_MAX_SCRIPTS)
     return false;