Remove dependency on dfelibs

The ACTS dfelibs repository is being retired. We use it very sparingly
in detray and only for its ability to read CSV files, so we can simply
take the CSV code and otherwise remove the dependency on an otherwise
dead project.

Author: stephenswat

CMakeLists.txt

@@ -225,21 +225,6 @@ if(DETRAY_SETUP_NLOHMANN)
     endif()
 endif()
 
-# Set up dfelibs.
-option(DETRAY_SETUP_DFELIBS "Set up the dfelibs target(s) explicitly" TRUE)
-option(
-    DETRAY_USE_SYSTEM_DFELIBS
-    "Pick up an existing installation of dfelibs from the build environment"
-    ${DETRAY_USE_SYSTEM_LIBS}
-)
-if(DETRAY_SETUP_DFELIBS)
-    if(DETRAY_USE_SYSTEM_DFELIBS)
-        find_package(dfelibs REQUIRED)
-    else()
-        add_subdirectory(extern/dfelibs)
-    endif()
-endif()
-
 # Set up GoogleTest.
 option(
     DETRAY_SETUP_GOOGLETEST

CMakePresets.json

@@ -36,7 +36,6 @@
             "DETRAY_SETUP_ACTSVG": "TRUE",
             "DETRAY_SETUP_BENCHMARK": "TRUE",
             "DETRAY_SETUP_COVFIE": "TRUE",
-            "DETRAY_SETUP_DFELIBS": "TRUE",
             "DETRAY_SETUP_NLOHMANN": "TRUE",
             "ALGEBRA_PLUGINS_INCLUDE_EIGEN": "TRUE",
             "ALGEBRA_PLUGINS_SETUP_EIGEN3": "TRUE",

cmake/detray-config.cmake.in

@@ -26,7 +26,6 @@ include( CMakeFindDependencyMacro )
 find_dependency( algebra-plugins )
 find_dependency( covfie )
 find_dependency( vecmem )
-find_dependency( dfelibs )
 find_dependency( nlohmann_json )
 if( DETRAY_DISPLAY )
    find_dependency( actsvg )

extern/dfelibs/CMakeLists.txt

@@ -83,7 +83,7 @@ file(
 detray_add_library( detray_csv_io csv_io
    ${_detray_csv_io_public_headers}
 )
-target_link_libraries(detray_csv_io INTERFACE dfelibs::dfelibs detray::io_utils)
+target_link_libraries(detray_csv_io INTERFACE detray::io_utils)
 
 # Test the public headers of the detray I/O libraries.
 if(BUILD_TESTING AND DETRAY_BUILD_TESTING)