add CMake dependency handling for portability

code/.gitignore

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+# Build artifacts
+build/
+*.o
+*.so
+*.dylib
+*.dll
+
+# Dependencies: Tarballs immer committen, entpackte ignorieren
+
+deps
+!deps/single_includes/
+!deps/tarballs/*.tar.*
+
+deps/eigen/
+deps/boost/
+deps/cgal/
+!deps/cgal/include/     # Falls einzelne Includes brauchst
+!deps/eigen/Eigen/
+!deps/boost/boost/
+
+# IDEs
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# OS
+.DS_Store
+Thumbs.db
+
+# ---> C++
+# Prerequisites
+*.d
+
+# Compiled Object files
+*.slo
+*.lo
+*.o
+*.obj
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Compiled Dynamic libraries
+*.so
+*.dylib
+*.dll
+
+# Fortran module files
+*.mod
+*.smod
+
+# Compiled Static libraries
+*.lai
+*.la
+*.a
+*.lib
+
+# Executables
+*.exe
+*.out
+*.app
+