Port RobotecSplineTools to O3DE 2605; verify Smoothing and LevelModificationTools

Gems/RobotecSplineTools/3rdParty/Findcsv-parser.cmake

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+# Fetches the "CSV for C++" library's generated single-header release asset
+# (vincentlaucsb/csv-parser) at configure time.
+if (TARGET 3rdParty::csv-parser)
+    return()
+endif()
+
+set(CSV_PARSER_VERSION "5.3.0")
+set(CSV_PARSER_URL "https://github.com/vincentlaucsb/csv-parser/releases/download/${CSV_PARSER_VERSION}/csv.hpp")
+set(CSV_PARSER_SHA256 "330b0d8950ff8b566ae726c022e2396f1dcdee36cb9ad6f6c1badc8febbf4319")
+
+include(FetchContent)
+FetchContent_Declare(
+    csv-parser
+    URL ${CSV_PARSER_URL}
+    URL_HASH SHA256=${CSV_PARSER_SHA256}
+    DOWNLOAD_NO_EXTRACT TRUE
+)
+FetchContent_MakeAvailable(csv-parser)
+
+message(STATUS "SplineTools Gem uses csv-parser-${CSV_PARSER_VERSION} (MIT License) ${CSV_PARSER_URL}")
+
+add_library(csv-parser INTERFACE)
+target_include_directories(csv-parser INTERFACE ${csv-parser_SOURCE_DIR})
+
+# The header defaults CSV_ENABLE_THREADS to 1, which pulls in std::thread/pthread.
+target_compile_definitions(csv-parser INTERFACE CSV_ENABLE_THREADS=0)
+
+get_property(this_gem_root GLOBAL PROPERTY "@GEMROOT:${gem_name}@")
+ly_get_engine_relative_source_dir(${this_gem_root} relative_this_gem_root)
+set_property(TARGET csv-parser PROPERTY FOLDER "${relative_this_gem_root}/External")
+
+add_library(3rdParty::csv-parser ALIAS csv-parser)
+
+set(csv-parser_FOUND TRUE)

Gems/RobotecSplineTools/3rdParty/NOTICE.txt

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+The "CSV for C++" library is Open Source, MIT-licensed contribution by Vincent La, available at https://github.com/vincentlaucsb/csv-parser. It is fetched at CMake configure time via FetchContent (see Findcsv-parser.cmake).