Drop CMake < 3.18 Support

[ptheywood]

Remove CMake < 3.18 support and modernise CMake

CMake < 3.18 was already deprecated as 3.18 is required for c++17 CUDA

• Updates visualiser repository version to access improvement(s)
• Adds some missing override statements
• Updates the readme version requirements
• Updates CMake Minimum required statements
• Removes workarounds for old CMake versions
• Use FindCUDAToolkit now it is always available
• Switch to linking against the shared cuda runtime library, rather than implicit default of static on some platforms
• Create INTERFACE library targets for header only libraries. This enforces the use of SYSTEM on includes
• Create ALIAS library targets for 3rd party dependencies, for consistency
• Stops the modification of CMAKE__FLAGS which is poor form
• Switches from global defines/includes/links to per-target through the use of target specific functions
• Ensure packages are available where they are used
• Prevent in-source CMake builds
• Use PUBLIC/INTERFACE/PRIVATE for link libraries etc. This may currently be excessivly public
• Inherit visualisation dependency from target, required vis repo update.
• Cmake organisation
• Adjusts swig/python CMake to re-use components from elsewhere more
  • This file could do with work still
• Misc other CMake changes
• Uses try_compile to check for <chrono> support with GCC and NVCC
  • This is a more specific fix for GCC 10.3.0 internal compiler error #575 than just disabling based on the version number, as patched versions exist. GCC 10 on Ubuntu 20.04 is still broken currently. Closes GCC 10.3.0 internal compiler error #575.

1/3 of #611
Closes #586