Python script: Ensure image handlers are loaded before loading a board,.

because a board can include bitmap images using various formats, all
available image handlers must be loaded.
From master branch

Fixes https://gitlab.com/kicad/code/kicad/-/issues/18959

pcbnew/python/scripting/pcbnew_scripting_helpers.cpp

@@ -57,6 +57,7 @@
 #include <locale_io.h>
 #include <wx/app.h>
 #include <wx/crt.h>
+#include <wx/image.h>
 
 
 static PCB_EDIT_FRAME* s_PcbEditFrame = nullptr;
@@ -140,11 +141,13 @@ PROJECT* GetDefaultProject()
     return project;
 }
 
+
 BOARD* LoadBoard( wxString& aFileName, PCB_IO_MGR::PCB_FILE_T aFormat )
 {
     return LoadBoard( aFileName, aFormat, false );
 }
 
+
 BOARD* LoadBoard( wxString& aFileName, PCB_IO_MGR::PCB_FILE_T aFormat, bool aSetActive )
 {
     wxFileName pro = aFileName;
@@ -152,6 +155,11 @@ BOARD* LoadBoard( wxString& aFileName, PCB_IO_MGR::PCB_FILE_T aFormat, bool aSet
     pro.MakeAbsolute();
     wxString projectPath = pro.GetFullPath();
 
+    // Ensure image handlers are loaded, because a board can include bitmap images
+    // using various formats.
+    // By default only the BMP handler is available.
+    wxInitAllImageHandlers();
+
     // Ensure the "C" locale is temporary set, before reading any file
     // It also avoid wxWidget alerts about locale issues, later, when using Python 3
     LOCALE_IO dummy;