keepout in footprint: fix some crashes and issues. Create a specific type (PCB_MODULE_ZONE_AREA_T) for zones in footprint. The new class (MODULE_ZONE_CONTAINER) is the same as ZONE_CONTAINER, but the type ID is PCB_MODULE_ZONE_AREA_T instead of PCB_ZONE_AREA_T.

This is mandatory because these zones must be handled differently in many functions.

include/core/typeinfo.h

@@ -92,6 +92,7 @@ enum KICAD_T
     PCB_TEXT_T,             ///< class TEXTE_PCB, text on a layer
     PCB_MODULE_TEXT_T,      ///< class TEXTE_MODULE, text in a footprint
     PCB_MODULE_EDGE_T,      ///< class EDGE_MODULE, a footprint edge
+    PCB_MODULE_ZONE_AREA_T, ///< class ZONE_CONTAINER, managed by a footprint
     PCB_TRACE_T,            ///< class TRACK, a track segment (segment on a copper layer)
     PCB_VIA_T,              ///< class VIA, a via (like a track segment on a copper layer)
     PCB_MARKER_T,           ///< class MARKER_PCB, a marker used to show something