Cpplint 2 fixes

[ptheywood]

• Suppress <filesystem> warnings
• Suppress namespace indenting warnings which are incorrect
• Fix some whitespace warnings
• Suppress whitespace warnings in macros that would result in a change of __LINE__ behaviour in macros
• Fix missing include warnings

Closes #1241

[mondus]

Added missing includes but error on my local machine

FLAMEGPU2\include\flamegpu/detail/cuda.cuh(121): error : identifier "cuCtxGetId" is undefined

Which is odd as I am on CUDA 12.3. Pushing for now as I have run out of time. Might just be my system.

[ptheywood]

12.0 and 12.3 on linux locally for me are fine with your changes, so assuming it's an msvc/your machine issue.

More importantly all_lint passes now with cpplint 2, so assuming windows CI passes this is good to merge IMO.

@Robadob (or @mondus) will have to do the formal review on GH, as I'm unable to as the original PR author (though I can skip the checks anyway)

[Robadob]

Example builds for me locally (Windows, Debug, Vis=OFF, Seatbelts=ON, CUDA 12.1)

Lint flamegpu/tests both pass locally too.