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Trailing newlines are no longer required for log messages.

A small prefix letter now indicates a debug-level message,
and a large prefix letter indicates an error-level message.

waypipe now records all wl_surface.damage requests made to a given surface,
and at surface commit time, determines which range of bytes in the attached
wl_buffer's memory pool file may have changed. This range can be much
smaller than the size of the file, so that change detection on the range
can be significantly cheaper than full-file change detection.

This commit also sets up subtyping for struct wp_object, to reduce the memory
usage needed for typical objects.

Currently, waypipe requires these to correctly identify which wayland
messages consume a passed file descriptor.

This commit ensures that when a series of messages read from
either the compositor or application is truncated halfway through
a message, that the truncated message is completed and correctly
parsed on the next iteration of the message transport state machine.

Previously, the main proxy loops in `run_server_child` and
`run_client_child` alternated between making transfers from their shared
channel to their individual wayland compositor/application channels.

By using socket connections in nonblocking mode, the proxy now can
simultaneously maintain transfers in both directions. This ensures that
large transfers (such as a full-screen image) do not prevent e.g. key
release events from being transferred.

Additionally, as the two proxy loops were very similar, they have been
 combined into the `main_interface_loop` routine.

The code still does not correctly handle the case where a read from
the wayland compositor/application fills the entire read buffer and
truncates a sent message, but it is now easier to adjust for that case.

When shadow_fd structs _that are owned by known protocol objects_
have their reference count drop to zero, they are deleted.

Newly created shadow_fd's begin with a reference count of 1,
which is reduced when the translated fd to sent to the
display/application/other waypipe socket end. This ensures
that the object is not deleted early, even if the compositor
e.g. wl_display.delete_id's the fd owning object before receiving
it.

For wl_shm_pool.resize, wl_shm.create_pool, and wl_surface.commit .

* Make scdoc optional; documentation is not strictly necessary
* Explicitly test for fmacro-prefix-map support
* Test for the minimum possible versions of wayland dependencies
* Reduce required meson version

Every wp_object has a nullable reference to the shadow structure
for a file descriptor. As the existence of wayland protocol
objects is not guaranteed in the face of compositor/application
misbehavior, when e.g. a wl_buffer is created from a wl_shm_pool,
the wl_buffer registers a reference to the file descriptor that
the wl_shm_pool had. Methods that imply a file descriptor change
(wl_keyboard.keymap, wl_surface.commit) mark the object's referenced
file descriptor as dirty, so that changes can be transferred.

This commit does not yet implement any deletion logic.

No real content yet. Using clang-format as the least of all evils.