Allow SWIG access to lset

SWIG doesn't like initializer lists because they are compile-time
objects

Fixes https://gitlab.com/kicad/code/kicad/-/issues/19326

common/lset.cpp

@@ -51,6 +51,16 @@ LSET::LSET( std::initializer_list<PCB_LAYER_ID> aList ) :
     }
 }
 
+LSET::LSET( const std::vector<PCB_LAYER_ID>& aList ) :
+    LSET()
+{
+    for( PCB_LAYER_ID layer : aList )
+    {
+        if( layer >= 0 )
+            set( layer );
+    }
+}
+
 
 LSET::LSET( const LSEQ& aSeq ) :
     LSET()

include/lset.h

@@ -45,6 +45,8 @@ public:
 
     LSET( std::initializer_list<PCB_LAYER_ID> aList );
 
+    LSET( const std::vector<PCB_LAYER_ID>& aList );
+
     LSET( const LSEQ& aSeq );
 
     LSET( const LAYER_RANGE& aRange );