PosixPP

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Lower required revision of CMake so LGTM can work.

Touchups on fd class. Documentation, moving stuff around, etc...

Several small changes.

1. Use noexcept in more places.
2. Make close call return expected<void>
3. Add dup and dup2.
4. Drop lambda for int to fd coversion and use inline static instead.

Fix warning about discard return value by adding error handling.

Explanatory comment.

Add permbits for use for the 'mode' argument.

Update interface for tests.

Add fdflags.h for flags associated with a file descriptor.

Completely rework flagset into being a factory for flagset types.

Update README.md to make location of canonical repo clear.

Add a flagset type for boolean flags as well as tests for it.

tempdir should log to clog, not stdout.

Working towards making this work as a sub-project.

Fiddling around with various strategies for movable results.

Use Catch2 as a sub-module rather than rely on system version.

Make README.md a bit clearer and more typographically interesting.

Rename err_type to err_t to make it consistent with result_t.

Add a lot more 'noexcept's. Add some documenting comments.

Tighten up types, add documentation. Add function to make it...
easy to transform values as they move up the call stack while preserving
error information.

Fix typo.

Oops, mentioned wrong library name.

Remove dead code.

Add noexcept as appropriate. Use constraints. Create version of...
expected<T> for things that _only_ have an error return for consistency.

Require newer cmake and C++20. I want to use concepts.

Fix indentation.

More tests, start actually testing file descriptor.

Require posixpp shared object for tests.

Add a whole bunch of tests using Catch2.

Ignore various IDE droppings.

Add a README about what I'm up to and why.