PR #783 Experiment with C++20 modules.

Experiment with C++20 modules. #783

jzmaddock wants to merge 8 commits into develop from modules_test_1

Experiment with C++20 modules.

9cac7a9f

correct missing #include.

65083b4c

Correct PP-logic.

b1896f63

Correct #include list.

c76f0bae

Add missing header and use import std if available

b39474d9

Test set fixes

db8f3789

Fix some more module errors.

d7ed41df

Merge branch 'develop' into modules_test_1

47331156

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