refactor: remove obsolete gdxml subdir and dependency (#286)

Drop the legacy gdxml library and tests, simplify U4GDML to write GDML
directly via Geant4, and
remove stale build/log/config hooks.

Closes #285

Author: plexoos

CMakeLists.txt

@@ -33,8 +33,6 @@ add_subdirectory(qudarap)
 add_subdirectory(qudarap/tests)
 add_subdirectory(CSGOptiX)
 add_subdirectory(CSGOptiX/tests)
-add_subdirectory(gdxml)
-add_subdirectory(gdxml/tests)
 add_subdirectory(u4)
 add_subdirectory(u4/tests)
 add_subdirectory(g4cx)

cmake/Config.cmake.in

@@ -14,6 +14,5 @@ find_dependency(OpenSSL REQUIRED)
 find_dependency(OptiX REQUIRED)
 find_dependency(Geant4 REQUIRED)
 find_dependency(CLHEP  REQUIRED)
-find_dependency(XercesC REQUIRED)
 
 include("${CMAKE_CURRENT_LIST_DIR}/@PROJECT_NAME@Targets.cmake")