Update MvsTexturing, fix GCP bug on Windows

SuperBuild/cmake/External-MvsTexturing.cmake

@@ -9,7 +9,7 @@ ExternalProject_Add(${_proj_name}
   #--Download step--------------
   DOWNLOAD_DIR      ${SB_DOWNLOAD_DIR}/${_proj_name}
   GIT_REPOSITORY    https://github.com/OpenDroneMap/mvs-texturing
-  GIT_TAG           262
+  GIT_TAG           264
   #--Update/Patch step----------
   UPDATE_COMMAND    ""
   #--Configure step-------------

stages/odm_georeferencing.py

@@ -125,7 +125,7 @@ class ODMGeoreferencingStage(types.ODM_Stage):
                 if reconstruction.has_gcp() and io.file_exists(gcp_gml_export_file):
                     log.ODM_INFO("Embedding GCP info in point cloud")
                     params += [
-                        '--writers.las.vlrs="{\\\"filename\\\": \\\"%s\\\", \\\"user_id\\\": \\\"ODM_GCP\\\", \\\"description\\\": \\\"Ground Control Points (GML)\\\"}"' % gcp_gml_export_file
+                        '--writers.las.vlrs="{\\\"filename\\\": \\\"%s\\\", \\\"user_id\\\": \\\"ODM_GCP\\\", \\\"description\\\": \\\"Ground Control Points (GML)\\\"}"' % gcp_gml_export_file.replace(os.sep, "/")
                     ]
                 
                 system.run(cmd + ' ' + ' '.join(stages) + ' ' + ' '.join(params))