Includes:
- fix int64x64 parsing order, remove cached entries in macros-and-definitions and in the docs
- update launch.json scratch names
- add a ctest entry per executable
- forward POSIX signal in ns3 (to get segmentation fault)
- prioritize Ninja generator instead of Makefiles
- add tests for unused utils source files
- remove dummy file and add tests to check for unused source files
- add missing examples and clean up unnecessary definitions
- missing feature entry for LTE used by pybindgen
- refactor CMake related filenames
- fix python libraries and include directories bindings
- fix brite example name
- Keep C++ compiler and flags when refreshing
- Disable precompiled headers when Ccache is found
- Mark find_external_library headers as advanced
- consolidate auxiliary files: build-status.py, _cache.py and .lock-waf_sys.platform_build files are merged into .lock-ns3_sys.platform_build
- scan .cc sources used in bindings and update docs
