Remove unused argument handling code

This code is not used anywhere, so it would be wise to remove it.

Author: stephenswat

examples/options/CMakeLists.txt

@@ -14,7 +14,6 @@ traccc_add_library( traccc_options options TYPE SHARED
   "include/traccc/options/clusterization.hpp"
   "include/traccc/options/detector.hpp"
   "include/traccc/options/generation.hpp"
-  "include/traccc/options/handle_argument_errors.hpp"
   "include/traccc/options/input_data.hpp"
   "include/traccc/options/output_data.hpp"
   "include/traccc/options/performance.hpp"
@@ -32,7 +31,6 @@ traccc_add_library( traccc_options options TYPE SHARED
   "src/clusterization.cpp"
   "src/detector.cpp"
   "src/generation.cpp"
-  "src/handle_argument_errors.cpp"
   "src/input_data.cpp"
   "src/output_data.cpp"
   "src/performance.cpp"