PosixPP

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Fix 'move to self' bug.

Move close to near top of member functions because it's important.

More dup documentation, add some TODOs.

Make read, write, and open be 'free' functions. Justification...

These are not intrinsic to every kind of file descriptor. If open is a
member, so should epoll_create, socket, and signalfd (among others). But
that would require dragging in a whole bunch of constants and types
associated solely with each of these calls. That doesn't seem right, the
fd type should be thin.

So, the fd type will now contain only a very few functions that are relevant
for just about any kind of file descriptor.

Of course, the magic of argument dependent lookup enables some of these now
'free' functions (like read and write) to be called without referencing the
namespace they're in because C++ rightly considers them part of the
interface for the fd type they take.

Use library to create tiny, no-runtime support program.

Fix exit.

Add exit system calls, also hard to test for.

Implement dup3 as well, and add TODO for test case.

Tests for dup and dup2.

Fix to use .native() instead of .string() to get filenames.

Update to latest version of Catch2 for sub-project.

Reduce log clutter from tempdir.

Fix and slightly extend open/write/close test to now be an...
open/write/close/open/read/close test.

Result doesn't need to be moved. Also, use is_valid(), not as_fd()

Ignore a directory full of saved experiments.

Add tests that would've caught the previous error, as well as...
tests that make sure the move and copy semantics work as expected.

Fix bug in expected.

Add target to use for temporary development experiments.

Remove dependency on variant. It uses virtual tables.

Revert CMake version since LGTM doesn't support C++20.

Configure git submodules like hg submodules is configured.

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.