More modules tinkering

[tcbrindle]

• Inline some non-template member functions
• Ensure the module can be built/imported in Windows CI runs

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (1864f09) 97.67% compared to head (e751375) 97.67%. Report is 3 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #109 +/- ## ======================================= Coverage 97.67% 97.67% ======================================= Files 66 66 Lines 2236 2236 ======================================= Hits 2184 2184 Misses 52 52 ``` | [Files Changed](https://app.codecov.io/gh/tcbrindle/flux/pull/109?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tristan+Brindle) | Coverage Δ | | |---|---|---| | [include/flux/core/assert.hpp](https://app.codecov.io/gh/tcbrindle/flux/pull/109?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tristan+Brindle#diff-aW5jbHVkZS9mbHV4L2NvcmUvYXNzZXJ0LmhwcA==) | `100.00% <100.00%> (ø)` | | | [include/flux/source/iota.hpp](https://app.codecov.io/gh/tcbrindle/flux/pull/109?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tristan+Brindle#diff-aW5jbHVkZS9mbHV4L3NvdXJjZS9pb3RhLmhwcA==) | `94.28% <100.00%> (ø)` | |

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[tcbrindle]

Alas, trying to build the module in Clang/MacOS CI runs into difficulties. I'll try again another time.