[DO NOT MERGE] Reorder core basics#7153

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AlisdairM wants to merge 10 commits intocplusplus:mainfrom

AlisdairM:reorder_core_basics

Commits on Jul 12, 2024

[cpp] Merge preprocessor directives into lex
AlisdairM
committed

Commits on Jul 16, 2024

Further work cleaning up preprocessor tokens
AlisdairM
committed

Commits on Jul 23, 2024